Gems of the World
Internationally renowned mineralogist, expert gemologist, and former curator of gemstones Oldershaw has written a wonderful reference guide to the field of gemology. In the lengthy introduction, she moves from basic explanations of various types of rocks and minerals to geodes, the formation of crystals, and the characteristics of precious and semiprecious gemstones. Even color formation is discussed and illustrated. We learn the differences between naturally and synthetically formed gems and ways of identifying the imitations, fakes, and forgeries. Skills of lapidary artisans, jewelers, and jewelry designers are referred to when discussing qualities of gemstones—their durability, clarity, surface types, etc. Advice is given on gem cutting, polishing, use of settings, general care, and cleaning. A large segment of the 70-page introduction is devoted to the diamond industry.  Following the introduction, an illustrated color key groups more than 130 varieties of precious and semiprecious stones into 8 color categories—yellow to brown, red to pink, blue to violet, green, colorless, white, black, and iridescent. In the gem description section, gems are arranged by chemical-composition classification. Each description includes color illustrations of rough and polished stones, various cuts (where appropriate), a specification chart, and prevalent locations throughout the world. The volume concludes with a series of world maps showing important gem locations. Comprehensive (though not all-inclusive) and lavishly illustrated, Gems of the World is intended for anyone who has ever been fascinated by crystals, jewelry, and gems, from general readers to seasoned professionals. It is a fine addition to general collections. --Ann Cohen--This text refers to an out of print or unavailable edition of this title.