• Sign In
    Sign Up
  • English speaking customer support only

    Toll Free - USA & Canada only:


  • Change Language
  • USD

More Unusual Gemstones for Collectors

There are many unusual gemstone varieties available today, many of which are considered to be lesser-known collector's gemstones, either because they are too rare or too fragile to wear as jewelry. However, just because they're classified as lesser-known collector's gems, it doesn't mean they're not important. Some unusual and lesser-known collector's gemstones include:

Faceted Scheelite Gemstone
Scheelite - Collector's Gemstone

Scheelite Gemstones

Scheelite is a calcium tungstate mineral named after Karl Wilhelm Scheele (1742-1786), a Swedish chemist. It is the primary ore for tungsten, an important metal for the jewelry industry that is often alloyed for the making of ring bands, pendants and necklaces. Scheelite is rarely found in gem-grade quality, rendering it one of the lesser-known gemstones of today. When cut and polished, scheelite has an attractive adamantine luster and high-quality crystals can exhibit excellent dispersion. Scheelite gemstones can be found in various colors including colorless, yellow, orange and brown. Scheelite deposits are found in various locations around the world, including Australia, England, Germany, Finland, Japan, Korea, Mexico, Peru, Spain, Sri Lanka and the United States (Connecticut, Utah, Arizona and California).

Painite Gemstones

Painite is a rare borate mineral first discovered in Myanmar (Burma) by British mineralogist, Arthur C.D. Pain, in 1954. Gemstone quality crystals were not discovered until 2001. For several years, only 3 painite crystals were known to exist, and up until 2005, only 25 crystals painite crystals had been found. Since then, more material has been discovered in Northern Myanmar, but painite remains one of the rarest and most unusual gemstones. Myanmar (Burma) is the world's only source for painite today. Painite is relatively hard at 8 on the Mohs scale. Painite color can range from brownish to red, and it has a vitreous luster when polished. Only a modest amount of transparent painite has been cut into gemstones, most of which have been distributed to institutions such as the British Museum of Natural History, GRS and GIA.

Gahnite Gemstones

Gahnite is an unusual gemstone often referred to as 'zinc spinel'. The mineral was named after Swedish chemist, Johan Gottlieb Gahn, who was the first to discover the unique mineral in 1807. Gahnite belongs to the important group of spinel gemstones. When zinc replaces all of spinel's magnesium content, the result is the unusual rare variety of zinc spinel we know as gahnite. Gahnite's color is normally very dark, often black in color, but some materials have been found in others colors such as blue, yellow, green, red and violet. Gahnite has a hardness of 7.5 to 8 on the Mohs scale, but owing to its rarity, it is usually faceted only for collectors.

Aragonite Gemstones

Aragonite Faceted Gemstone
Aragonite Collector's Gemstone
Aragonite is a lesser-known gemstone but the mineral itself is actually much more common than most assume. Aragonite is the primary constituent of most pearls as well as ammolite, another type of organic gemstone. Aragonite shares a chemical composition with calcite, which is calcium carbonate, but aragonite is much less common in occurrence, since it is rarely found in gemstone-quality deposits. Fine, transparent pieces are usually faceted only for collectors. Aragonite was named after Aragon, Spain, one of its earlier known localities. Today, deposits of aragonite are also found in Austria, Bolivia, England, Italy and the United States. Aragonite has a vitreous to silky luster and occurs in various shades of brown. Its hardness is only 3.5 to 4 on the Mohs scale and like all carbonates, it is susceptible to acid.

Brazilianite Gemstones

Brazilianite is an unusual gemstone named after the country of Brazil, where it was first discovered in 1944. It one of the very few phosphate minerals used as gemstones. Other phosphates include apatite and turquoise. Brazilianite is a relatively new gemstone discovery, but it is becoming a collector's favorite. Fine materials have excellent transparency and a vitreous luster. Its color is usually similar to that of chrysoberyl, but it can also be colorless. Brazilianite has a hardness rating of just 5.5 on the Mohs scale, which makes it rather soft, though it is one of the hardest of phosphate gemstone varieties. Despite being named after and discovered in Brazil (Minas Gerais), brazilianite is also found in New Jersey, United States.
  • First Published: November-13-2014
  • Last Updated: January-23-2019
*You're signing up to receive GemSelect promotional email.

Privacy Notice © 2005-2022 all rights reserved.

Reproduction (text or graphics) without the express written consent of (SETT Company Ltd.) is strictly prohibited.


More Shapes
Popular Gemstones
  • Sapphire
  • Emerald
  • Ruby
  • Aquamarine
  • Zircon
  • Opal
  • Topaz
  • Tourmaline
  • Garnet
  • Amethyst
  • Citrine
  • Tanzanite
All Gemstones (136)
  • Actinolite Cat's Eye
  • Agate
  • Agate Geode
  • Almandine Garnet
  • Amazonite
  • Amethyst
  • Amethyst Geode
  • Ametrine
  • Ammolite
  • Andalusite
  • Andesine Labradorite
  • Apatite
  • Aquamarine
  • Aventurine
  • Black Opal
  • Bloodstone
  • Boulder Opal
  • Carnelian
  • Cat's Eye Apatite
  • Cat's Eye Aquamarine
  • Cat's Eye Gemstones
  • Cat's Eye Moonstone
  • Cat's Eye Opal
  • Cat's Eye Scapolite
  • Chalcedony
  • Charoite
  • Chocolate Opal
  • Chrome Diopside
  • Chrysoberyl
  • Chrysocolla
  • Chrysoprase
  • Citrine
  • Color Change Gemstones
  • Color-Change Diaspore
  • Color-Change Fluorite
  • Color-Change Garnet
  • Color-Change Sapphire
  • Coral
  • Demantoid Garnet
  • Dendritic Agate
  • Diamond
  • Druzy Amethyst
  • Druzy Azurite
  • Druzy Variscite
  • Emerald
  • Enstatite
  • Fire Agate
  • Fire Opal
  • Fluorite
  • Fossil Coral
  • Garnet
  • Golden Beryl
  • Grandidierite
  • Grossularite Garnet
  • Hematite
  • Hemimorphite
  • Hemimorphite Druzy
  • Hessonite Garnet
  • Howlite
  • Idocrase
  • Imperial Topaz
  • Iolite
  • Jade Gemstones
  • Jadeite
  • Jasper
  • Kornerupine
  • Kunzite
  • Kyanite
  • Labradorite
  • Lapis Lazuli
  • Larimar
  • Malachite
  • Malaya Garnet
  • Mali Garnet
  • Maw-Sit-Sit
  • Moonstone
  • Morganite
  • Mother Of Pearl
  • Mystic Topaz
  • Nuummite
  • Obsidian
  • Opal
  • Opal Doublet
  • Opal In Matrix
  • Pearl
  • Peridot
  • Pietersite
  • Prehnite
  • Pyrite
  • Pyrope Garnet
  • Quartz
  • Quartz Cat's Eye
  • Quartz With Hedenbergite
  • Quartz With Marcasite
  • Rainbow Moonstone
  • Rainbow Pyrite
  • Rhodochrosite
  • Rhodolite Garnet
  • Rose Quartz
  • Rubellite Tourmaline
  • Ruby
  • Ruby In Fuchsite
  • Ruby-Zoisite
  • Rutile Quartz
  • Sapphire
  • Scapolite
  • Scolecite
  • Seraphinite
  • Sillimanite
  • Sillimanite Cat's Eye
  • Smithsonite
  • Smoky Quartz
  • Snowflake Obsidian
  • Sodalite
  • Spectrolite
  • Spessartite Garnet
  • Sphene
  • Spinel
  • Star Diopside
  • Star Garnet
  • Star Gemstones
  • Star Moonstone
  • Star Rose Quartz
  • Star Ruby
  • Star Sapphire
  • Strawberry Quartz
  • Sunstone
  • Tanzanite
  • Tiger's Eye
  • Tiger's Eye Matrix
  • Topaz
  • Tourmaline
  • Tsavorite Garnet
  • Turquoise
  • Variscite
  • Zircon
Main Categories
  • New Arrivals
  • Gemstone Lots
  • Calibrated Gemstones
  • Gemstones By Piece
  • Top Grade Gems
  • Matching Pairs
  • Cabochon Gemstones
  • Drilled Gems, Briolettes and Beads
  • Birthstones
  • Gemstone Carvings
  • Fancy Gemstones
  • Star Gemstones
  • Unheated Sapphire
English speaking customer support only

Toll Free - USA & Canada only:


Save Money
No shipping Fees for Additional Items!
$8.90 Worldwide Shipping

Update Translation
Current Value
New Value
GemSelect Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
X Close Window
Colored Gemstones
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