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Alexandrite, a remarkable colour-change gemstone, is often regarded as the "national gemstone of Russia," named after Tsarevich Alexander II. Its prestige stems from its stunning dual colours—green in daylight and red in incandescent light—reflecting the military colours of Imperial Russia. Although alexandrite is rarer than emerald, it is included among the "big four" gemstones: diamond, ruby, sapphire, and emerald. This book offers a historical overview of emerald mining in the Urals, detailing the discovery of Russian alexandrites in these mines, their naming, historical significance, and their display in mineralogical museums and the gem trade. It covers the morphology and twinning of rough alexandrite, including single crystals and various twin formations. The mineralogical and gemmological properties are thoroughly explained, with numerous photo-micrographs showcasing inclusions and growth patterns. The book also explores chatoyancy and asterism in alexandrite and chrysoberyl from Russia and Sri Lanka, along with characteristic growth patterns of both natural and synthetic varieties. Colorimetric data is presented using the CIELAB colour space, and trace element chemistry is discussed. An extensive appendix includes historical names, a timeline, and references, making this work invaluable for researchers, gemmologists, jewellers, and gem dealers, illustrated with over 200 colour figures and photographs.
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Russian alexandrites, Karl Schmetzer
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- 2010
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