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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.


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


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, ...


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


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).


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  ...


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


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