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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/Encyclopedia-Gemstones-Minerals-Martin-Holden/dp/0816021775

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

www.minerals.net

An interactive reference guide to rocks, minerals, and gemstones.

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).

nevada-outback-gems.com/Encyclopedia_pages/Gemstone_Encyclopedia.htm

This gemstone encyclopedia exists to inform those who enjoy gemstones and jewelry about the many types of stones that are available - not just the well known  ...

www.politicalavenue.com/PDF/ENCYCLOPEDIAS/Color%20encyclopedia%20of%20gemstones%20%5B53%20MB%5D.pdf

Library of Congress Cataloging-in-Publication Data. Arem, Joel E., 1943-. Color encyclopedia of gemstones. Bibliography: p. Includes index. 1. Precious stones.

www.encyclopedia.com/science-and-technology/chemistry/chemistry-general/gemstones

Get information, facts, and pictures about gemstones at Encyclopedia.com. Make research projects and school reports about gemstones easy with credible ...