Gemstones of the World, Revised Edition All the gemstones ever discovered are treated in their many variations. More than 1,500 full-color photos showcase each precious and semiprecious stone in all its singular glory--in both its rough natural state and its polished and cut renditions. Each entry offers complete information on a gemstone's formation and structure, physical properties and characteristics, methods of working, cutting, and polishing. Learn about the best known, including amethyst and diamond. Find full treatments of lesser-known gems, from andalusite to vesuvian. A special section is devoted to rocks as precious stones, including alabaster, onyx, obsidian, and fossils. Organic gem materials are also covered, such as coral, ivory, amber, and pearl, plus new on the market stones like charcoite. Everything is covered, including imitations, synthetics, and combined stones. Charts and tables help you identify Excellent gently used condition. Bundle up to 5lbs and save!