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Precious and Semi-Precious Gemstone and Mineral Glossary

Adamantine luster Refers to the diamond-like luster of a gemstone. Gemstones with a diamond-like luster include diamond (of course), demantoid garnet and sphene.

Demantoid Garnet with Adamantine Luster
Demantoid Garnet with Adamantine Luster

Adularescence Optical Phenomenon

The shimmering light or whitish opalescence which glides over the surface of some gems such as moonstone. Interference phenomena of the layered structure is the cause of this effect.

Alluvial Gemmy Deposits

Gem deposits found in water after they have been separated from the mother rock.

Amorphous Gemstone

Gemstones without a crystal structure are referred to as amorphous. These include gems such as amber, coral, opal and pearl.

Asterism Star Chatoyancy

The star effect that you see in star sapphires or rubies, for example. This is usually caused by tiny silk rutile inclusions in the stone. The effect can be four- or six- rayed.


A long rectangular gemstone shape, somewhat similar in shape to a loaf of French bread, hence the name.

Baroque Cut (Diamond-Cut)

A round shaped stone cut with a minimum of fifty-eight facets. An old faceting technique intended to maximize brilliance featuring eight-square symmetry often seen in modern-day diamond-cuts.


A hollow-drilled gemstone, usually round but can be foud in various other shapes, designed to be strung and hung.

Beryllium Treatment

A form of heat treatment for sapphire that adds the element beryllium to the heating process. Beryllium is an element well known in the gem world, since it is an essential constituent in many gemstones, including emerald, beryl, and aquamarine. When sapphires are heated with beryllium, the result is a reduction in blue tones. Thus bright yellow or orange sapphire can be produced from weak yellow or greenish gems. Some stunning colors have been produced using this method.


A gemstone exhibiting two color zones, such as ametrine or many tourmalines.


Some gemstones are singly refractive: they have only one refractive index. Other gemstones (in fact, most) are doubly refractive: they have two different refractive indices. When a beam of light enters a doubly refractive gem, it is split into two beams, each travelling at a different speed and on a different path through the crystal. Birefringence is a measurement of the difference between the two refractive indices in gems that are doubly refractive, and it ranges from a low of .003 to a high of .287. Very few gemstones are singly refractive; in fact, the only well-known gems with that property are diamond, spinel and garnet.


The association of gemstones with astrology goes back centuries. More recently, jewelers have adapted this tradition to create the current list of official birthstones.


The reflection and refraction of light displayed through a stone. Brilliance is sometimes referred to as "internal luster" to distinguish it from surface luster.


A tear or pear-shaped stone cut in triangular facets.

Cabochon Cut

A gem that is cut round without facets into the shape of a smooth polished dome. It lacks the facets that are on most faceted stones.

Calibrated (size)

Many gemstones are sold in calibrated or standard sizes that will fit commercial jewelry settings. Standard sizes are calibrated in millimeters for a number of different gem shapes.

Carat Weight

A unit of weight for gems. A carat is one fifth of a gram (0.2g).

Cat's Eye Chatoyancy

See Chatoyancy.

Center Stone Jewelry

The center stone is the prominent center piece in a jewelry setting that has multiple gemstones. See also Side Stone.

Chanthaburi, Thailand

The city in southeastern Thailand famous as one of the world centers for gemstone processing and Thai Gems trading. Chanthaburi is also famous for its weekend gemstone market.

Chatoyancy Phenomena

The cat's eye effect sometimes seen in gemstones such as chrysoberyl, apatite and tourmaline is known by the technical name of chatoyancy. The effect is caused by tiny parallel inclusions that give the appearance of a narrow line similar to a cat's eye. Often a gemstone needs to be viewed in natural light to see the chatoyancy effect.


Referring to a stone's lack of inclusions or other visual defects.


Used in the evaluation of a gem. The quality of a gem can based on either the presence or the absence of color.

Color Zoning

(color zoning) A term that describes the uneven distribution of color in a gemstone. Zoning is best seen when looking at the stone through the top table facet.

Color zoning examples can be very easily seen within bicolor ametrine; exhibiting both golden citrine and violet or purple amethyst in a single crystal.

Color Change (gemstones)

Color change gems change color due to changing light conditions (such as alexandrite or color change sapphire) or when viewed from different angles (such as andalusite or iolite).

Concave Cut

Traditional gem facets are flat or two-dimensional. Concave cutting creates facets that are curved or three-dimensional. These curved facets refract more of the ambient light and return it to the eye as brilliance. Concave cutting is a recent innovation dating back to the early 1990s. It requires considerable expertise and results in higher weight loss to the rough stone, since more material must be cut away to create the curved facets.

Corn Flower Blue (sapphire)

The best Sri Lankan sapphire is descriped as being a rich 'cornflower blue' - said to rival that of fine Kashmir Sapphire and Burmese sapphires. Cornflower blue is described as light and bright, rather than deep and inky blue.


The top of a gemstone above the girdle.


Gemstones that contain traces of copper are very rare and typically have a intense blue, blue-green or violet color. There was considerable excitement in the gem world when the first copper-bearing gemstones were discovered in 1989. See also Paraiba.


A crystalline form of aluminum oxide known in the gemstone world as ruby and sapphire. It is naturally clear, but can have different colors when impurities are present. Corundum is much admired for its hardness (9.0 on the Mohs scale), brilliance and excellent wearability.

Cubic zirconia

A lab created diamond simulant, often abbreviated as CZ. While CZ is a transparent stone, trace elements can be added to the manufacturing process, producing a wide range of colors. On the Mohs scale of hardness, CZ is harder than other gemstones except for diamond, ruby, sapphire and chrysoberyl. Not to be confused with zircon, a natural gemstone.


The lowest part of a gemstone. This looks like the tip or point of the stone.

It is the most lowest facet in a cut stone.


See Copper-bearing. Learn about copper-bearing gemstones.

Ceylon Blue (sapphire)

A light to medium blue color of gem-quality corundum originating from Ceylon (Sri Lanka). Sri Lanka is now one of the world's leading producers of fine sapphire.

Demantoid Garnet

Demantoid is a rare and valuable andradite garnet. It exhibits a range of greens from dull to bright emerald green and on rare occasions displays yellow. On the Mohs scale of hardness, demantoid is relatively soft at 6.5. It has an adamantine luster.


The ratio of a gemstone when compared to the weight of an equal volume of water. This means how heavy a gemstone is compared to the same volume of water. Also known as "specific gravity" for solids.

Diamond Cut

Also known as the brilliant cut, the style of cutting a stone with multiple facets to maximize brilliance. Modern round brilliant cuts have 58 facets.


A term meaning the ability of some gems to display a second color when viewed from a different angle. A dichroscope can see this change, and is used for identifying certain stones.

Diffusion Treatment

A form of heat treatment that adds one or more chemicals to the heating process to change the color of a gemstone. Typically the treatment does not penetrate deep into the stone, so gems treated in this way cannot be recut. Diffusion treatment is a standard treatment to increase the asterism in star sapphire.


The separation of light into the seven spectral colors, causing the "fire" of a gemstone, which is refracted by the internal facets. Diamond has a very high dispersion, hence its high amount of "fire".

Double Refraction

The ability of most gems to split rays of light into two unequally refracted rays. Also called 'birefringence'.


A doublet is a gemstone composed of valuable gemstone material in combination with other materials. It is found most often seen in gem types such as ammolite or opal; an opal doublet contains a slice of opal glued to common opal, glass or other material. A triplet contains a slice of opal glued between a base and a crystal or a glass top. Triplets are usually less expensive than doublets, and both are less expensive than natural opals. Doublets may occasionally be found with sapphire or other expensive gemstones.

Eye Clean

Refers to a gemstone that appears to have no visible inclusions or imperfections to the naked eye. Compare Loupe Clean.


The cut and polished flat plane of a gemstone. There can be dozens of facets on a stone.

Fancy Cut

Sometimes used to refer to a gemstone cut in any shape other than the standard round cut, but also used to refer to gemstones that are cut in a shape other than the well known shapes of round, oval, pear, trillion, marquise, etc.


The rainbow of colors that light rays form as they move through a gemstone. This is another word for dispersion.


A surface crack on a gemstone. Gems with fissures may be fracture filled.


The ability of some gems to appear a different color when viewed under ultraviolet light. Whether or not a stone has fluorescence is a valuable aid in gem identification.

Fracture Filling

Small cracks or fissures in a gemstone can interrupt the flow of light through the stone, creating white or "dead" spots in the color of the stone. Sometimes these fractures will be filled with material that will allow the light to pass through smoothly. Different materials are used; oil, wax, glass, epoxy, and borax are common materials. The most commonly filled stones are emerald, turquoise and ruby.

Full Cut

A round-shaped, brilliant-cut gemstone.

Gemstone Cleavage

The plane of weakness of some gems where they will split apart with smooth surfaces. Gems with perfect cleavage are likely to break when being cut or faceted.

Gemstone Point (measurement)

A gemstone unit of weight equal to 1/100 of a carat, often used in reference to diamond weight; e.g., a 5 point diamond is equal to a 0.05 carat diamond.

Gemstone Rough

In gemology, this refers to the raw, natural state in which gems are found, before they are cut.


The widest point in circumference of a gem. This is the point where a gem is usually held by fingers or tweezers for examination.

Greasy Luster

One of the the technical terms used to refer to the luster of a gemstone. Jadeite is an example of a gem with a greasy luster.

Heat Treatment

The application of high heat to a gemstone in order to improve its color and clarity.


Refers to the position of a color on the color wheel, or the dominant wavelength of color attributed to a gemstone. There are six primary hues: violet, blue, green, yellow, orange, and red. In between these primary hues are secondary hues, such as blue-green. See also tone and saturation.


Foreign matter that is "included" within a stone. This may be a foreign body such as a crystal, a gas bubble or a pocket of liquid. There are many varieties of inclusions and they are important visual clues for identifying the type of gemstone and for identifying the origin of the stone.

Indicolite Tourmaline

Blue tourmaline. From bright blue hues to bluish green colors, indicolite tourmaline is one of the rarer tourmaline colors.


A play of color effect caused by the interference of light on thin films within the gemstone.


Exposing gemstones to radioactive rays from x-rays or other material to change or enhance the original color. Blue topaz is always irradiated, for example.


Karat (as distinguished from Carat) is a measure of the purity of gold. Most gold jewelry is actually made from a gold alloy containing gold and another metal or metals. 18K gold, for example, is 75% pure gold.

Lab created (synthetic)

Refers to gemstones created in a laboratory rather than by nature. A lab created gemstone is typically the same material chemically as its natural counterpart, as in the case of corundum produced by flame fusion or quartz grown using the hydrothermal method.


The science and art of cutting and polishing gems to their finished state.

Light Refraction

The bending of light as it enters a medium and slows down.

Loupe Clean

A gemstone is said to be loupe clean when no inclusions or defects are visible when the gem is viewed with 10 times magnification. See also Eye Clean.


The outward appearance of a gem or organic material. The quantity and quality of light that is reflected from the surface of a stone. Luster is important especially when evaluating the quality of pearls.

Marquise Shape

The marquise shape is an elongated oval with points on both ends. Said to be named after the Marquise de Pompadour, the mistress of King Louis XV.

Metallic Luster

One of the technical terms used to refer to the luster of a gemstone. A gemstone that is reflective like polished metal is said to have a metallic luster. Hematite and labradorite are some of the better examples.

The Mohs Hardness Scale

A numerical scale ranging from 1 to 10 developed by Friedrich Mohs that assigns a rating to a gem according to its ability to resist scratching. The hardest is 10 (diamond) and the softest is 1 (talc).

Synthetic Moissanite

A lab-created diamond simulant based on the structure of natural moissanite. On the Mohs scale of hardness, moissanite is 9.5. It has more brilliance, fire and luster than any hard jewel on earth, including diamond.

Oiling Treatment

Oiling infuses colorless oils, resins or waxes into tiny surface-breaking fissures to hide them and give certain gemstones a cleaner appearance. This long-practiced clarity enhancement is used mainly for emerald and jade. The oils used are either natural or have a natural counterpart. If coloring agents are added to the oil, the stones are classified as dyed rather than oiled.

Opaque Clarity

A term used for gemstones that light cannot be seen passing through. Lapis lazuli and malachite examples of opaque gemstones.

Organic Gemstones

Most gemstones are minerals with a crystal structure but some gems, such as amber and pearl, are organic rather than mineral, being formed by plants and animals. See also Amorphous gemstones.

Padparadscha Sapphire

Derived from the Sinhalese term for "lotus flower," padparadscha refers to a lush pink and orange sapphire resembling the color of the lotus. Padparadscha is also sometimes used to refer to other types of gemstones, such as topaz and tourmaline, with this unique coloration.


A rare copper-bearing tourmaline with an intense blue or blue-green color, first found in the state of Paraiba in Brazil in 1989. There have been recent finds in Nigeria and Mozambique of similar material, and the term "paraiba" is now used to refer to all examples of this copper-bearing tourmaline. See also Copper-bearing.


The lower portion of a gemstone that begins just below the girdle.

Pear Cut Gemstone

Resembling a pear or teardrop, this fancy cut is rounded at one end and pointed at the other.

Phenomenal Gems

Gems that display unusual optical properties such as color change, chatoyancy, asterism or iridescence.

Pigeon's Blood Ruby

Refers to the most prized color of red in rubies. Pigeon's blood red is thought to be a pure red with a hint of blue. It is associated most with rubies from Burma, though any ruby could be this color.


The ability of certain gems to display two or more colors when viewed from different angles. This is a term also used for dichroism and trichroism.

Precious Gems

The classic precious 4 gemstones are diamond, emerald, ruby and sapphire. However, new precious gems are being added, such as precious coral, opal and topaz.

Portuguese Cut

The Portuguese cut refers to a particular type of faceting where the gem is cut with three rows (simple cut = two rows) of rhomboidal and two rows of triangular facets above the girdle (crown) and four rows of rhomboidal and one row of triangular facets below the girdle (pavilion). The Portuguese cut thus has an extra row of facets on the crown, and this style enhances the brilliance of the gem. The Portuguese cut is one of the most popular fancy cuts in the market and you'll find many varieties of gems cut in this style.

Precious (gemstone)

Traditionally, the four precious gemstones are diamond, ruby, sapphire and emerald. But other gems have also been labelled precious at times, including opal and amethyst. Today, the distinction between precious and semi-precious gems has been rejected by some gem trade associations. See also Semi-Precious gemstones.

Refractive Index

View Refractive Index Chart. A process using a refractometer to measure the speed and angle of light entering a gemstone. Very important for gem identification.

Rubellite Tourmaline

Used to refer to the red variety of tourmaline, including the color range from pink to red. More of a marketing than a gemological term; these days gemologists tend to use simply "red tourmaline."


Needle-like inclusions (or foreign matter) within stones. These can produce some gem phenomena such as asterism (star) or cat's eye (chatoyancy).


Saturation is one of three characteristics used to describe the appearance of color. Saturation (also known as intensity) refers to the brightness or vividness of a color. See also hue and tone.

Semi-precious gemstones

Traditionally, the four precious gemstones are diamond, ruby, sapphire and emerald. Semi-precious gemstones include everything else. But other gems have also been labelled precious at times, including opal, amethyst and pearl. Today, the distinction between precious and semi-precious gems has been rejected by some gem trade associations. See also Precious gemstones.


This effect resembles luster, and is caused by light reflection from inclusions or texture inside the gem. Luster is light reflected from the surface of the gem and sheen is reflection from inside the gemstone.

Side Stone

Side stones are set around or beside the center stone in a jewelry setting.

Single Cut

Stones with seventeen facets or fewer.

Singly Refractive

Most gemstones are doubly refractive; they have two refractive indices. Only a few gemstones have a single refractive index, specifically diamond, spinel and garnet. See also Birefringence.


A solitaire, often found in rings and pendants, is a single stone in a simple setting. Compare Center Stone and Side Stone.


The term used to designate a family of gemstones. For example, corundum is a species that contains the varieties sapphire and ruby. The quartz family contains amethyst, citrine, and chalcedony, to name a few.

Specific Gravity

see density -- View specific gravity chart.

Step Cut Gemstones

A gem cut with rectangular facets along the perimeter.

Swiss Cut

A gem cut consisting of thirty-three facets.

Synthetic gemstone (lab-made or man-made)

A synthetic gemstone is man-made rather than mined from the earth. Natural gemstones that are treated by industry-accepted methods such as heat or irradiation are not classified as synthetic.


The flat top part of a gemstone. The table is the largest facet.


One of three characteristics used to describe the appearance of color. Tone refers to the lightness or value of the lightness in a particular stone. See also Saturation and Hue.


A quality of a gemstone transmitting light imperfectly so that one cannot see through the stone clearly. Star sapphire is an example of this quality.


There are several ways a light travels through a stone. In a transparent stone, the light travels through stone with virtually no distortion. Transparent stones are clear and easy to see through. See also Translucent and Opaque.

Treated stone

A stone that has been heated, dyed, irradiated, or stained in order to improve the color or the clarity. Also pertains to gems that have their cracks or fractures concealed by filling the material.


A property of a stone that will show three colors when the stone is viewed through a dichroscope.

Trillion Cut

A faceted cut in a triangular shape with 44 facets.

Vitreous Luster

A technical term referring to the luster of a gemstone; vitreous luster is synonymous with glass-like luster. Gemstones with a vitreous or glassy luster are by far the most common in the gems world.


One of the technical terms used to refer to the luster of a gemstone. Turquoise is an example of a gem with a waxy luster.


In a well cut faceted gem, the pavilion facets (those on the lower half of the stone) should reflect light back out the top or table of the stone. If the facets are cut below the critical angle for the particular material, light will pass right through the stone instead of being reflected back toward the eye. When this happens the gem will lack sparkle and brilliance.

  • First Published: October-23-2006
  • Last Updated: November-08-2018
  • © 2005-2019 all rights reserved.
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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

Size Comparison Chart