Structured reference

Gemstone directory

Browse visual profiles, then narrow the index with properties that matter.

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20 gemstones

Filtered combinations are not indexed unless they become reviewed editorial guides.

Diamond editorial reference image

Diamond

Diamond

Diamond is a crystalline form of carbon and the benchmark material at 10 on the Mohs hardness scale.

Mohs 10.00White / Colorless
Ruby editorial reference image

Corundum

Ruby

Ruby is the red gem variety of corundum; chromium is the principal trace element associated with its color.

Mohs 9.00Red
Blue Sapphire editorial reference image

Corundum

Blue Sapphire

Blue sapphire is blue gem-quality corundum; sapphire also names corundum in colors other than ruby red.

Mohs 9.00Blue
Emerald editorial reference image

Beryl

Emerald

Emerald is the green to bluish-green gem variety of beryl, colored principally by chromium and/or vanadium.

Mohs 7.50-8.00Green
Alexandrite editorial reference image

Chrysoberyl

Alexandrite

Alexandrite is a color-change gem variety of chrysoberyl. Detailed reference values are pending editorial review.

Mohs PendingColor-changing
Tanzanite editorial reference image

Zoisite

Tanzanite

Tanzanite is the blue-to-violet gem variety of zoisite. Detailed reference values are pending editorial review.

Mohs PendingBlue
Paraíba Tourmaline editorial reference image

Gem material

Paraíba Tourmaline

Paraíba tourmaline is copper-bearing tourmaline known for vivid blue-to-green colors. Detailed reference values are pending editorial review.

Mohs PendingBlue
Amethyst editorial reference image

Quartz

Amethyst

Amethyst is the purple gem variety of quartz. Detailed reference values are pending editorial review.

Mohs PendingPurple
Aquamarine editorial reference image

Beryl

Aquamarine

Aquamarine is the blue to greenish-blue gem variety of beryl. Detailed reference values are pending editorial review.

Mohs PendingBlue
Topaz editorial reference image

Topaz

Topaz

Topaz is a mineral species used as a gem in several colors. Detailed reference values are pending editorial review.

Mohs PendingMulticolor
Opal editorial reference image

Gem material

Opal

Opal is a hydrated silica material valued in gemology, including varieties that display play-of-color. Detailed reference values are pending editorial review.

Mohs PendingMulticolor
Tourmaline editorial reference image

Gem material

Tourmaline

Tourmaline refers to a complex mineral group that produces gem material in many colors. Detailed reference values are pending editorial review.

Mohs PendingMulticolor
Garnet editorial reference image

Gem material

Garnet

Garnet names a group of related silicate minerals with several gem varieties. Detailed reference values are pending editorial review.

Mohs PendingMulticolor
Spinel editorial reference image

Spinel

Spinel

Spinel is a distinct mineral species found in numerous gem colors. Detailed reference values are pending editorial review.

Mohs PendingMulticolor
Peridot editorial reference image

Gem material

Peridot

Peridot is the green gem variety associated with olivine-group minerals. Detailed reference values are pending editorial review.

Mohs PendingGreen
Zircon editorial reference image

Zircon

Zircon

Zircon is a natural mineral species and should not be confused with cubic zirconia. Detailed reference values are pending editorial review.

Mohs PendingMulticolor
Moonstone editorial reference image

Gem material

Moonstone

Moonstone is a feldspar gem associated with the optical phenomenon adularescence. Detailed reference values are pending editorial review.

Mohs PendingWhite / Colorless
Jadeite editorial reference image

Jadeite

Jadeite

Jadeite is a pyroxene mineral and one of the two mineral materials commonly called jade. Detailed reference values are pending editorial review.

Mohs PendingGreen
Turquoise editorial reference image

Turquoise

Turquoise

Turquoise is an opaque blue-to-green phosphate mineral used as a gem and ornamental material. Detailed reference values are pending editorial review.

Mohs PendingBlue
Morganite editorial reference image

Beryl

Morganite

Morganite is the pink to orange-pink gem variety of beryl. Detailed reference values are pending editorial review.

Mohs PendingPink