Gemstones of the World

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Specialists in earth science products since 1998, we serve the public, universities and colleges throughout the Globe as well as offering trade accounts to a wide range of geological services. New to this recent edition is a chapter discussing the symbolic and supposed medicinal significance of different gem materials. You'll find full treatments of lesser-known gems and minerals-from andalusite to vesuvianite-and a special section devoted to rocks as precious stones, including alabaster, onyx, obsidian, and fossils. Each stone has its name clearly written beneath its picture as well as what location it is found in the world. There are even full treatments of lesser-known gems; a special section on rocks as precious stones; and organic gem materials.

All the gemstones are treated in their many variations: more than 1,500 full-color photos showcase each precious and semiprecious stone in both its rough, natural, and its polished and cut renditions.The comprehensive listing of gem materials that includes many of the most important identifying features makes it useful for identifying both common and unusual gemstones. His many field guides provide expert advice and education on how to identify gemstones, rocks, minerals. This updated edition contains a new chapter on the treatment of gemstones, expanded information on whats 'New on the Market' and 400 additional stones. These first few sections serve as an excellent introduction to, or refresher on, many of the basic concepts that help make identification easier. The book also fully covers the optical features of gems - light and colour, luminescence, refraction and inclusions - and key information about the densities and chemical elements of each stone, with fascinating details on different cuts, polishing, gems, hardness, cleavage, classification, trade names, rarity and more.

With many charts and diagrams, Schumann offers full coverage of the optical features of gems - light and color, luminescence, refraction, and inclusions - and about densities and the chemical elements of each stone, with fascinating details on different cuts, polishing, synthetic and imitation gems, hardness, cleavage, classification, trade names, rarity, and much more - all with an easy-to-understand text. Charts and tables help you identify unknown gemstones and--when you're in the market--how to check for authenticity. Moh’s scale of hardness, basic mineral chemistry, specific gravity, cleavage and fracture, refraction and absorption, pleochroism, and fluorescence are described in sections followed by charts of these properties for selected gemstones.True-color photographs picturing gemstones, many in rough and polished states, with full details of where they are found, how they are mined and cut, how they are imitated, how they are identified and classified, what their characteristics and physical properties are.

Physical and chemical properties of each gem or gem group is identified in a header on the top of the left page, followed by notes of interest and specific varieties. Gemstones in this collection include: Sapphire, tourmaline, garnet, topaz, diamond, pearl, citrine, amethyst, peridot, chrome diopside, tanzanite, Iolite. I have lost count how many times I have been to Thailand on Holiday and this book is a wonderful find if you’re visiting this beautiful country, especially if you would like to purchase gems. Charts and tables help you identify unknown gemstones and-when you're in the market-how to check for authenticity. illustrated cloth covered boards, hardcover; 256 pages; black and white and color illustrations; lightly edge-rubbed boards with a lightly edgeworn dust jacket else very good.The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products.

Next is a section of “new on the market” gemstones such as sugilite, unakite, and petrified wood; an odd assortment of new and not-so-new offerings. In addition to the perennially successful Gemstones of the World, first published in 1976, he has authored Collins Guide to Rocks, Minerals, and Gemstones and Handbook of Rocks, Minerals, and Gemstones, among other authoritative guides.

This formatting continues throughout the next section, the lesser-known gemstones which are becoming more popular, such as fluorite, apatite, and chrysocolla. More than 1,500 full-colour photos showcase each precious and semiprecious stone in its rough, natural, polished and cut renditions.