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en.wikipedia.org/wiki/Gemstone

A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make ... From Wikipedia, the free encyclopedia. Jump to: navigation, search.

www.gia.edu/gem-encyclopedia

Gem Encyclopedia is a virtual journey through the science and lore of Gemstones from across the globe. Each Gem page features Gemological Information, ...

www.gemsociety.org/gemstone-encyclopedia

Agate is distinguished by having multiple colors. While not usually as rich as our crystalline gems, the colors can be quite vivid. Agates are sometimes opaque, ...

www.amazon.com/Color-Encyclopedia-Gemstones-Joel-Arem/dp/0442208332

Buy Color Encyclopedia of Gemstones on Amazon.com ✓ FREE SHIPPING on qualified orders.

www.amazon.com/Color-Encyclopedia-Gemstones-Joel-Arem/dp/0412989115

Color Encyclopedia of Gemstones [Joel E. Arem] on Amazon.com. *FREE* shipping on qualifying offers. Provides information on all known gemstone species ...

www.amazon.com/Color-Encyclopedia-Gemstones-Joel-Arem/dp/0442203330

Color Encyclopedia of Gemstones [Joel E. Arem] on Amazon.com. *FREE* shipping on qualifying offers. This book should be of interest to gemologists; gem  ...

www.amazon.com/Encyclopedia-Gemstones-Minerals-Martin-Holden/dp/0816021775

Buy The Encyclopedia of Gemstones and Minerals on Amazon.com ✓ FREE SHIPPING on qualified orders.

www.amazon.com/Encyclopedia-Rocks-Minerals-Gemstones-Russell/dp/1571455620

Buy Encyclopedia of Rocks, Minerals, and Gemstones on Amazon.com ✓ FREE SHIPPING on qualified orders.

www.newworldencyclopedia.org/entry/Gemstone

A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. The biggest pebble here is 40 millimeters long (1.6 inches).