Guide to Gems (Firefly Pocket series)

<p> <i>A reference guide to gems, semi-precious stones and crystals.</i> </p><p> Gemstones and crystals are used for jewelry, industry, lasers and precision technology. <b>Firefly Guide to Gems</b> is a practical, compact guide to the identification and use of precious and semi-precious stones, novelty stones, agates and crystals. </p><p> An introduction explains geology, chemistry and gemstone properties in clear and accessible terms. Key aspects of gemstones are explained such as crystal structures and optical and physical properties. </p><p> The first section of the book focuses on precious gems in their many forms, with illustrations of priceless jewelry. Practical information includes: Fashioning and cutting Types and shapes of cut Collecting Handling and storing gemstones Weighing and measuring stones </p><p> The second and main section supplies complete descriptions of a wide range of gems, organized by chemical composition, for instance: Carbon (diamond) Aluminum oxide (saphire and ruby) Phosphate (turquoise) Silica (opal) </p><p> A fascinating profile of each gem is accompanied with color photographs of the raw crystal, common cuts, and finally polished for use in jewelry. At-a-glance charts provide technical details such as refractive index, crystal group, luster, hardness and cleavage for each gem. </p><p> Easy-to-read and abundantly illustrated, <b>Firefly Guide to Gems</b> is ideal for collectors and rockhounds. </p>