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Gem Trivia

• Agate
• Alexandrite and other varieties of chrysoberyl
• Amethyst (originally a "cardinal gem", but now no longer so, since huge quantities were discovered in Brazil and the price plummeted)
• Aquamarine and other varieties of beryl
• Chrysocolla
• Chrysoprase
• Diamond
• Emerald
• Feldspar (moonstone)
• Garnet
• Hematite
• Jade - jadeite and nephrite
• Jasper
• Lapis lazuli
• Malachite
• Obsidian
• Olivine (Peridot)
• Opal (Girasol)
• Pyrite
• Quartz and its varieties, such as tiger's-eye, citrine, agate, and amethyst
• Ruby
• Sapphire
• Spinel
• Sugilite
• Tanzanite and other varieties of zoisite
• Topaz
• Turquoise
• Tourmaline
• Zircon

This article is licensed under the "GNU Free Documentation License".  It uses material from the Wikipedia article "Gemstones".

Minerals that infrequently occur in gem quality form:

• Andalusite
• Axinite
• Cassiterite
• Clinohumite
• Iloite
• Kornerupine

Artificial or synthetic materials used as gems include:

• High-lead glass
• Synthetic cubic zirconia
• Synthetic corundum
• Synthetic spinel
• Synthetic moissanite

There are a number of organic materials used as gems, including:

• Amber
• Bone
• Coral
• Ivory
• Jet (lignite)
• Mother of pearl
• Ammolite - from fossils formed from the shells of extinct ammonites.
• Pearl
• Tortoiseshell