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Gemstone Type List: Guide to Precious & Semi-Precious Color Gemstones

GemSelect's list of precious & semi-precious gemstones: With over 130 gem varieties, our gemstone index will help you find the perfect colored stone for your jewelry & crystal healing needs

Actinolite Cat's Eye Gemstones

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Actinolite is a rare translucent variety of chatoyant actinolite. It is an amphibole silicate that is sometimes mistakenly called 'cat's eye jade'.
Read More: Actinolite Cat's Eye Information
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Agate Gemstones

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Agate is a form of chalcedony quartz that forms in concentric layers in a remarkable variety of colors and textures.
Read More: Agate Information
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Agate Geode Gemstones

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Agate Geodes are a form of chalcedony quartz that forms in concentric layers in a remarkable variety of colors and textures within rock cavities or vugs with internal crystal formations.
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Alexandrite Gemstones

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Alexandrite is one of the rarest of all colored gemstones and is famed for its color change from green in daylight to red under incandescent light.
Read More: Alexandrite Information
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Almandine Garnet Gemstones

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Almandine garnet the most common garnet, is dark-brownish or purplish-red. Garnet is very popular for its excellent hardness and brilliance.
Read More: Almandine Garnet Information
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Amazonite Gemstones

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Amazonite is a gemstone variety of green microcline, a feldspar mineral. It is named after the Amazon River in Brazil, although no deposits have been found there.
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Amber Gemstones

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Amber, the fossilized, hardened resin of the pine tree, is one of the few gemstones of organic origin. Most amber is found in the Baltic, where it formed about 50 million years ago.
Read More: Amber Information
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Amethyst Gemstones

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Amethyst is the most precious gemstone within the quartz group. Amethyst ranges in color from pale lilac to deep reddish-purple.
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Amethyst Geode Gemstones

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Amethyst Geode is a trade name for violet quartz that forms within rock cavities and is often traded under names such crystal clusters or crystal plates.
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Ametrine Gemstones

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Ametrine is a form of quartz that occurs in bands of yellow and purple, a combination of the colors of amethyst and citrine.
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Ammolite Gemstones

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Ammolite is a rare gemstone of organic origin that is fairly new to the market, with commercial mining beginning only in 1981.
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Andalusite Gemstones

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Andalusite is a strongly pleochroic gem, which means that it can display different colors when viewed from different angles.
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Andesine-Labradorite Gemstones

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Supplies of andesine-labradorite are quite recent, with the mineral found in a range of colors, including red, yellow, champagne and green.
Read More: Andesine-Labradorite Information
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Apatite Gemstones

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Apatite, a stone seldom found in jewelry stores, is beloved by collectors for its many different colors and forms.
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Aquamarine Gemstones

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Aquamarine is best known for its breathtaking range of blue colors and belongs to the same family as emerald (beryl). Aquamarine is colored by trace amounts of iron.
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Aventurine Gemstones

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Aventurine is a type of green quartz often used for carvings and cabochons.
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Axinite Gemstones

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Axinite is a group of brown to violet-brown or reddish-brown minerals that sometimes occur in gem quality. Axinite is distinctive for its strong vitreous luster.
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Azotic Topaz Gemstones

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A new high tech enhancement process using thin film deposition has created this new-look topaz.
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Beryl Gemstones

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Beryl is one of the most important gem minerals. The most famous beryl is emerald, but other beryl varieties include aquamarine, heliodor and morganite.
Read More: Beryl Information
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Black Opal Gemstones

Black Opal Cabochon - GemSelect
Black Opal is the most valuable opal variety. Its dark body color can range from dark to black and acts as the base for the spectrum of colors it can exhibit.
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Bloodstone Gemstones

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Bloodstone, also known as heliotrope, is a green gemstone dotted with bright red spots of iron oxide.
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Boulder Opal Gemstones

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Boulder opal is the second most prized form of opal, after black opal. The name is derived from the fact that boulder opal is found embedded in ironstone boulders.
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Calcite Gemstones

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Pure calcium carbonate is colorless, but calcite is often colored by various impurities, including iron, magnesium, manganese, zinc or cobalt.
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Carnelian Gemstones

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Carnelian is a brownish red to orange variety of chalcedony quartz, colored by trace amounts of iron. Darker colors (red-brown to brown) are often referred to by the name sard.
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Cassiterite Gemstones

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Cassiterite is one of the densest gem materials known. It also has a very high refractive index, higher than zircon, sphene and demantoid garnet.
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Cat's Eye Apatite Gemstones

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Chatoyancy (the cat's eye effect) in cat's eye apatite is the reflection of light by parallel fibers, needles, or channels, which resemble the slit eye of a cat.
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Cat's Eye Aquamarine Gemstones

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Aquamarine is best known for its breathtaking range of blue colors and belongs to the same family as emerald. Cat's eye aquamarine is quite rare.
Read More: Cat's Eye Aquamarine Information
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Cat's Eye Diaspore Gemstones

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Diaspore, sometimes marketed under the name zultanite, is a color change gem from Turkey. Cat's eye diaspore is fairly rare.
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Cat's Eye Scapolite Gemstones

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Scapolite is a sodium calcium aluminum silicate with a hardness of 5.5 to 6 on the Mohs scale. It is named after the Greek word for "stick", since its crystals grow in columns.
Read More: Cat's Eye Scapolite Information
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Cat's Eye Tourmaline Gemstones

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Tourmaline with tiny parallel inclusions sometimes displays a strong cat's eye effect when polished.
Read More: Cat's Eye Tourmaline Information
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Chalcedony Gemstones

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Chalcedony is the fine-grained variety of the silica mineral quartz. It has a waxy luster and appears in a great variety of colors.
Read More: Chalcedony Information
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Charoite Gemstones

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Charoite is a new gem on the market, first appearing in 1978. It is found only in one location in Siberia, Russia. The swirling shapes of lavender and violet are quite unique.
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Chrome Diopside Gemstones

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Chrome diopside is colored by chromium and displays a rich forest green that has similarities with tsavorite garnet and chrome tourmaline.
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Chrome Tourmaline Gemstones

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Chrome tourmaline is a distinct variety of tourmaline colored by chromium. It is sometimes referred to as chrome dravite and is known for its rich forest green color.
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Chrysoberyl Gemstones

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Faceted chrysoberyl is a beautiful gem which is not as well known as it deserves. Apart from the very good hardness (8.5 on the Mohs scale), it has excellent luster.
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Chrysoberyl Cat's Eye Gemstones

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The most famous and valuable cat's eye gemstone is chrysoberyl cat's eye. It is valued for its excellent hardness (8.5) and sharp cat's eye.
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Chrysocolla Gemstones

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Chrysocolla is hydrous copper silicate. Often confused with turquoise, chrysocolla is found in unusual multicolor combinations as well as blue or green.
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Chrysoprase Gemstones

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Chrysoprase is a gemstone variety of chalcedony or cryptocrystalline quartz, colored by trace amounts of nickel. Its color varies from apple-green to deep green.
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Citrine Gemstones

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Named after the French word for lemon, citrine is yellow, gold or orange-brown transparent quartz.
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Clinohumite Gemstones

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Clinohumite is a rare mineral and an especially rare gemstone. Only three sources of gem-quality clinohumite material are known; in Tajikistan, Siberia and Tanzania.
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Color-Change Diaspore Gemstones

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Diaspore, sometimes marketed under the name zultanite or csarite, is a natural color change gemstone mined from Turkey, which was recently introduced to the international market.
Read More: Color-Change Diaspore Information
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Color-Change Garnet Gemstones

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Color-change garnet is a mix of spessartite and pyrope garnet. This garnet presents a color change from brownish in daylight to rose pink in incandescent light.
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Color-Change Sapphire Gemstones

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Some rare sapphires exhibit a color change under varying lighting conditions. Color change sapphires are typically blue in natural light and purple under incandescent light.
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Coral Gemstones

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Precious coral is a species of coral that grows in rocky seabottoms. Coral exhibits a range of warm reddish-pink colors ranging from salmon pink to deep-red.
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Danburite Gemstones

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Danburite gets its name from Danbury, Connecticut, where it was first discovered in 1839. It is quite hard, with a rating of 7 to 7.5 on the Mohs scale.
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Demantoid Garnet Gemstones

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Demantoid garnet is the rarest and most valuable of the garnets. Found in green to emerald green, demantoid garnet is scarce and is typically only seen in small sizes.
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Dendritic Agate Gemstones

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Dendritic agate is a whitish-gray or colorless chalcedony with fern-like inclusions known as dendrites. The inclusions look like plant material, but they are actually iron or manganese.
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Diamond Gemstones

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Diamond, the hardest known natural material, is a transparent carbon crystal. Diamond is famed not only for its superb hardness, but also for its high refractive index and dispersion.
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Dumortierite Quartz Gemstones

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Dumortierite quartz is an unusual quartz that is intergrown with the mineral dumortierite. The inclusions of dumortierite give it a deep blue color that is unique in the world of quartz.
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Emerald Gemstones

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Emerald is the most precious stone in the beryl group. The wonderful green color of emerald is unparalleled in the gem world.
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Enstatite Gemstones

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Enstatite is a rare gemstone that belongs to the pyroxene group of minerals. It is typically brown-green with a vitreous luster and is a collector's gem.
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Fire Agate Gemstones

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Fire agate is a type of opaque, limonite-bearing chalcedony with an iridescence caused by the diffraction of light in its layered structure.
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Fire Opal Gemstones

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Fire opal is an unusual variety of opal from Mexico, which can be yellow, orange or orange-red. Some fire opal gemstones are clear enough for facets.
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Fluorite Gemstones

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Fluorite is a mineral with a veritable plethora of brilliant colors that include purple, blue, green, yellow, colorless, brown, pink and orange.
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Fossil Coral Gemstones

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Fossil coral is a decorative material that is formed when ancient coral is gradually replaced with agate. The proper name for this material is agatized coral.
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Gaspeite Gemstones

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A recent discovery (1966), gaspeite is a very rare nickel carbonate mineral named after the place in Eastern Canada where it was first described.
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Goshenite Gemstones

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The colorless precious beryl is known as goshenite. It is named after the small town of Goshen in Western Massachusetts where it was first described.
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Grandidierite Gemstones

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Grandidierite is a rare greenish-blue gemstone named after Alfred Grandidier. It is often listed as one of the top 10 rarest gems in the world.
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Grossularite Garnet Gemstones

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Grossularite (or grossular) garnet is a calcium-aluminium garnet. The name grossular is derived from the botanical name for the gooseberry, grossularia.
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Hackmanite Gemstones

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Hackmanite exhibits an unusual phenomenon known as reversible photochromism, where a mineral changes color when exposed to sunlight.
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Hambergite Gemstones

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Hambergite is one of the lesser-known gemstones. It is usually nearly colorless, with the vitreous luster of glass when cut. It is quite a hard material, with a hardness of 7.5.
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Hematite Gemstones

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Hematite is iron oxide that is typically blackish-gray. When highly polished it can sometimes look like silver. Hematite is a remarkably dense material.
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Hemimorphite Gemstones

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Hemimorphite is usually found in aggregate form with blue and white bands, or mixed with a dark matrix.
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Hessonite Garnet Gemstones

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Hessonite is an orange-brown variety of garnet colored by traces of manganese and iron. It is sometimes known as cinammon stone.
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Hiddenite Gemstones

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Hiddenite is a form of spodumene containing chromium. The green color varies from a yellowish to a bluish-green.
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Howlite Gemstones

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Howlite is an interesting grayish-white mineral that is sometimes referred to as white turquoise because of its distinctive veining.
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Idocrase Gemstones

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Idocrase is also known as vesuvianite, since it was originally found on Mt. Vesuvias. The color is normally green, but it can also be brown, yellow, blue or purple.
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Imperial Topaz Gemstones

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The most sought after of all natural topaz is called imperial topaz. Its rich golden color with reddish and orange overtones is generally not enhanced by any kind of treatment.
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Iolite Gemstones

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Pleochroism is very pronounced in iolite and is seen as three different color shades in the same stone; violet, yellow-gray and blue.
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Jadeite Gemstones

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Jadeite is found in most colors, including pure white, pink, brown, red, orange, violet, blue, black and a range of greens.
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Jasper Gemstones

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Jasper is usually considered a type of chalcedony, however, scientists put it in a group by itself because of its grainy structure.
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Kornerupine Gemstones

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Kornerupine is a rare transparent to translucent, typically brownish-green collector's gem. It was named after Danish naturalist, artist and explorer, Andreas Nikolaus Kornerup.
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Kunzite Gemstones

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Kunzite is the pale pink-violet to light-violet species of the mineral spodumene. Kunzite is named in honor of the mineralogist George F. Kunz.
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Kyanite Gemstones

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Kyanite is a layered crystal with a vitreous to almost pearly luster that is usually found in a sapphire-like blue color.
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Labradorite Gemstones

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Labradorite is a member of the plagioclase feldspar group and displays a distinctive schiller in lustrous metallic tints.
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Lapis Lazuli Gemstones

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Lapis lazuli has been used for thousands of years in jewelry and ornamental objects. The unique deep blue color has never lost its attraction.
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Larimar Gemstones

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The blue variety of pectolite has become known as Larimar. A very rare mineral, it has only been found in the Dominican Republic, where it was first discovered in 1974.
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Lepidolite Gemstones

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Lepidolite is a lilac-gray or rose-colored lithium-bearing mineral of the mica group. It is one of the major sources of the rare alkali metals rubidium and caesium.
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Malachite Gemstones

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Malachite is copper carbonate with distinctive green veining. Though not a particularly hard stone, it takes an excellent polish.
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Mali Garnet Gemstones

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Mali Garnet is one of the hybrid garnets, a mixture of grossular and andradite garnets. It gets its name from the African country where it was first discovered.
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Maw-Sit-Sit Gemstones

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Maw-sit-sit is an unusual gemstone often classified as a member of the jade family. It was first discovered in 1963 and was named after a village in Northwestern Burma.
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Melanite Gemstones

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Melanite is the black variety of the rare andradite garnet. It is sometimes known as titanian andradite.
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Moldavite Gemstones

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Moldavite is a bottle-green to brown-green gemstone belonging to the tektite group. It is formed from condensed rock vapors after a meteorite impact.
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Moonstone Gemstones

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Moonstone is a unique stone that reflects light in a distinctive shimmering phenomenon known as adularescence.
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Morganite Gemstones

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The pink form of beryl was named morganite, after the American banker and collector J.P. Morgan. A soft pink to violet, morganite belongs to the same family as emerald.
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Moss Opal Gemstones

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Moss opal is a milky white opal with unique inclusions of green hornblende in moss-like patterns.
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Mystic Quartz Gemstones

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Mystic quartz is the product of a new high tech enhancement process, whereby a coating is applied to colorless quartz.
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Mother of Pearl Gemstones

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Mother of Pearl is an organic gemstone that comes from the inside of some mollusk shells. Mother-of-pearl is made from nacre, which is mainly calcium carbonate.
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Mystic Topaz Gemstones

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Colorful mystic topaz is the product of a high tech enhancement process that is stable and permanent.
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Nuummite Gemstones

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Nuummite is an opaque metamorphic rock with an iridescent play of color. Its chief constituent minerals are gedrite and anthophyllite.
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Obsidian Gemstones

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Obsidian is naturally occurring volcanic glass. It is formed when felsic lava extruded from a volcano cools without crystal growth.
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Onyx Gemstones

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Onyx is the black form of chalcedony, a cryptocrystalline form of quartz.
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Opal Gemstones

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More than any other gem, each opal is unique. No other stone has such rich and varied folklore. Opals are also the most delicate gems commonly worn.
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Opal Doublet Gemstones

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An opal doublet consists of a slice of natural opal glued to a black backing, which causes the color to become more vibrant.
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Orthoclase Gemstones

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Orthoclase is a transparent yellow feldspar resembling citrine quartz or yellow beryl, found primarily in Madagascar.
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Paraiba Tourmaline Gemstones

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Paraiba tourmaline is a rare copper-bearing gem with a vivid neon blue color. First found in Brazil in 1989, similar material has since been found in Africa.
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Peanut Wood Gemstones

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Peanut wood is a variety of petrified wood, where the shape and structure of the wood is pre- served when the original organic material is replaced by quartz.
Peanut Wood Gems
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Pearl Gemstones

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Pearls are products of bivalve mollusks (mainly oysters and mussels). They are built up of nacre, which is mainly calcium carbonate in the form of aragonite crystals.
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Peridot Gemstones

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Peridot belongs to the forsterite-fayalite mineral series. It is an idiochromatic gem, meaning its color comes from the basic chemical composition of the mineral itself, rather than impurities.
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Pietersite Gemstones

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Pietersite is a breccia aggregate of hawk's eye and tiger's eye, with swirling colors of blue, rusty red, gold and brown.
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Prehnite Gemstones

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Prehnite, a form of calcium aluminum silicate, has a vitreous to pearly luster. Affordably priced for its size, prehnite makes distinctive and interesting jewelry.
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Pyrope Garnet Gemstones

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Pyrope garnet is the most famous of the red garnets. Its dark, blood red color often resembles the color of ruby.
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Quartz Gemstones

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Quartz is one of the most common minerals on Earth and is well known in the gemstone world in its many forms including amethyst, citrine and ametrine.
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Quartz Cat's Eye Gemstones

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Quartz cat's eye is quartz in which inclusions of rutile create chatoyancy (the cat's eye effect). Usually found in white, green, yellow or brown.
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Rainbow Moonstone Gemstones

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A combination of orthoclase and albite arranged in layers cause the lovely sheen. Despite the name, rainbow moonstone is actually a variety of labradorite with a multicolored adularescence.
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Rainbow Pyrite Gemstones

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Rainbow pyrite is a recent find from Russia. The material comes in the form of druzy - a layer of miniature pyrite crystals coating a matrix.
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Rhodochrosite Gemstones

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Rhodochrosite is usually found in an aggregate form with alternating light and dark stripes in zigzag bands.
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Rhodolite Garnet Gemstones

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Rhodolite garnet is the name applied to a mixture of pyrope and almandite. Rhodolite tends to be lighter in color than most other kinds of red garnet.
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Rhodonite Gemstones

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Rhodonite is a manganese iron magnesium calcium silicate, and a member of the pyroxenoid group of minerals.
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Rose Quartz Gemstones

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The unique soft pink color of rose quartz is thought to be derived from tiny traces of titanium. Rose quartz crystals tend to be cloudy, which deepens its color.
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Rubellite Tourmaline Gemstones

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Vivid pink to red tourmaline, often with a violet tinge, is known as rubellite. It is one of the most valuable tourmaline colors.
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Ruby Gemstones

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Ruby is the red variety of corundum, the 2nd hardest substance on the Mohs scale, with a rating of 9. It is the combination of hardness and rich color that makes fine ruby so valuable.
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Ruby-in-Fuchsite Gemstones

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Ruby-in-fuchsite is a natural combination of ruby and fuchsite in the same specimen. It is an interesting and colorful stone, with blue to emerald-green fuchsite and pink, purple or red ruby inclusions.
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Ruby-Zoisite Gemstones

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Ruby-zoisite is the natural combination of ruby and zoisite crystals in a single specimen. It is often used for carvings.
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Rutile Quartz Gemstones

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Rutile quartz is clear or smoky quartz with inclusions of rutile crystals.
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Rutile Topaz Gemstones

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Rutile topaz is colorless topaz with inclusions that look like rutile crystals. But the inclusions are actually thin channels of limonite staining.
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Sapphire Gemstones

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Sapphire, with its excellent hardness, second only to diamond, is one of the four traditional precious gemstones.
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Scapolite Gemstones

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As a gemstone scapolite is not well known, but it can be a very attractive stone. Its color, which is usually a vibrant yellow, orange, pink or violet, is its best feature.
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Seraphinite Gemstones

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Seraphinite is a trade name for a particular form of clinochlore. The dark-green color of seraphinite is enhanced by a silvery and feathery shimmer caused by mica inclusions.
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Serpentine Gemstones

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Serpentine is a type of green magnesium silicate aggregate. It is used as a decorative stone or for carvings.
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Sillimanite Cat's Eye Gemstones

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Sillimanite is a type of aluminum silicate that is related to both andalusite and kyanite. In fact, these three minerals share the same chemical composition but have different crystal structures.
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Smithsonite Gemstones

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Smithsonite is one of two zinc-containing minerals discovered by the British mineralogist James Smithson. The zinc silicate was named smithsonite in his honor.
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Smoky Quartz Gemstones

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Smoky quartz is fast becoming a designer favorite for its earthy tone and tribal look. It is one of the few gemstones that is gray or brown.
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Snowflake Obsidian Gemstones

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Obsidian is a naturally occurring volcanic glass. In some stones, the inclusion of white crystals of cristobalite produce a blotchy pattern, known as snowflake obsidian.
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Sodalite Gemstones

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The mineral sodalite gets its name from its sodium content. As a gemstone, sodalite is usually blue, often with a violet tint, and frequently contains white veins of calcite.
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Spessartite Garnet Gemstones

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The most valuable spessartite garnets display a bright, orange-red. The best specimens come from Namibia.
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Sphalerite Gemstones

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Sphalerite is a rare collector's gem which has exceptional dispersion (also known as fire). In fact its dispersion rating is three times as high as that for diamond.
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Sphene Gemstones

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Sphene is a brilliant yellowish-green, green or brown gemstone of high luster, unique color shades and, with brilliant cut, an intense fire.
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Spinel Gemstones

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Due to its excellent hardness and clarity, spinel is an excellent gemstone for all types of jewelery. Spinel is never treated in any way.
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Spodumene Gemstones

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Spodumene is a relatively new mineral to science, with gem varieties discovered only in the last 120 years. Spodumene occurs in white, gray, pink, lilac and green.
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Star Diopside Gemstones

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Diopside is best known for the vivid green chrome diopside, but the black diopside exhibiting asterism (also known as the star effect) is also important.
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Star Garnet Gemstones

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Star garnet is a rare and unusual garnet, found only in Idado in the USA and India. It displays a four-rayed star due to aligned inclusions of rutile.
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Star Lemon Quartz Gemstones

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Star lemon quartz is a lemon-yellow variety of quartz that displays asterism (the star effect).
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Star Moonstone Gemstones

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Moonstone is a combination of orthoclase and albite arranged in layers which cause the lovely sheen. Star moonstone exhibits a stunning four-rayed star effect.
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Star Rose Quartz Gemstones

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Rose quartz displaying asterism or the star effect is rare. The unique soft pink color of rose quartz is thought to be caused by tiny traces of titanium.
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Star Ruby Gemstones

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Star ruby is a ruby that displays asterism, a six-rayed star that shimmers over the surface of the stone when it is moved.
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Star Sapphire Gemstones

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Star sapphire is a sapphire that contains unusual tiny needle-like inclusions. These needles produce a phenomenon called asterism.
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Star Sunstone Gemstones

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Sunstone is plagioclase feldspar with a unique glitter from platelets of hematite. Typically it has a red glitter, and more rarely a blue or green glitter. Star sunstones are known but rare.
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Strawberry Quartz Gemstones

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Quartz with red inclusions of lepidocrosite, hematite or goethite is often sold under the name strawberry quartz.
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Sugilite Gemstones

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Sugilite is an obscure and quite rare mineral named after the Japanese geologist, Ken-ichi Sugi, who discovered it in 1944.
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Sunstone Gemstones

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Sunstone is a type of plagioclase feldspar that exhibits a spangled appearance, due to reflections of red hematite.
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Tanzanite Gemstones

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Tanzanite is a variety of zoisite. Colors of tanzanite include blue, purple and green. The highly coveted color is deep blue, which has a purple pleochroism.
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Tashmarine Diopside Gemstones

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Tashmarine diopside is a brilliant yellow-green diopside from a recent discovery in Tajikistan, Uzbekistan and Western China.
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Tiger's Eye Gemstones

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Tiger's eye is a type of opaque macrocrystalline quartz with a fibrous structure. It typically displays chatoyant stripes, because structural fibers are crooked or bent.
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Tiger's Eye Matrix Gemstones

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Tiger's eye matrix is the name given to tiger's eye that is cut and finished with some of its host rock intact.
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Topaz Gemstones

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Topaz is an important gem due to its hardness and high refractive index. Topaz comes in many colors and blue topaz is especially popular.
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Tremolite-Hexagonite Gemstones

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Tremolite is a rare gemstone sometimes known as 'hexagonite' or 'tremolite-hexagonite'.
Tremolite-Hexagonite Gems
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Tourmaline Gemstones

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One of the most versatile of gems, tourmaline is found in every color. It can show every tone from pastel to dark, and can display various colors in the same stone.
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Tsavorite Garnet Gemstones

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The green species of garnet known as tsavorite was discovered in 1967 by British geologist Campbell R. Bridges in the bush along the frontier between Kenya and Tanzania.
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Turquoise Gemstones

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Turquoise, the blue cousin of lapis lazuli, has been known and valued for thousands of years. The early mines in Sinai, Egypt, were already worked out in 2000 B.C.
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Variscite Gemstones

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Variscite is a relatively rare type of phosphate mineral. High quality specimens are used as gemstones and for carvings. Variscite is colored by traces of chromium.
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Verdite Gemstones

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Verdite is light to dark-green serpentine rock that is often spotted or variegated. Most specimens come from South Africa and Zimbabwe.
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Zircon Gemstones

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Zircon has great brilliance and intensive fire, due to its high refractive index and strong dispersion.
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  • First Published: October-17-2007
  • Last Updated: January-22-2019
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    Reproduction (text or graphics) without the express written consent of GemSelect.com (SETT Company Ltd.) is strictly prohibited.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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