"A wonderful reference guide to the field of gemology.... Comprehensive [and] lavishly illustrated." -- Booklist This is a practical, comprehensive guide to the identification and use of precious and semiprecious gems, novelty stones, agates and crystals. Presenting information on the gemstone industry, with an extensive section on ethical mining, conflict diamonds and the emergence of new diamond centers, Gems of the World is a completely up-to-date reference. Oldershaw clearly explains the geology, chemistry, properties and key aspects of gemstones. The book includes descriptions of a wide range of gems, each profiled with a color photograph showing its raw crystal, common cuts and polished state for use in jewelry. At-a-glance charts identify refractive index, crystal group, luster, hardness and cleavage.
