Gemstones of the World
Sterling Publishing Company, Inc., 2006 - 311 Seiten
Gemstones of the World is truly the single volume that every hobbyist, jeweler, jewelry maker, and rockhound needs: it’s the cornerstone of the field. And this updated edition contains a host of new findings on “Gemstones for Collectors,” additional gems in the “Table of Constants,” and the “double fraction” figures that experts have long wanted—a very special new feature.
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. Each entry offers complete information on the gemstone’s formation, structure, physical properties, and characteristics, along with the best methods of working, cutting, and polishing it. There are even full treatments of lesser-known gems, from andalusite to vesuvian, and 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. Charts and tables help collectors identify unknown gemstones and check for genuineness.
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Origin and Structure
Properties of Gemstones
Classifications of Gemstones
Description of Gemstones
Absorption spectrum agate aggregates Alexandrite Amber Amethyst Apatite Aquamarine Aragonite Australia Aventurine blue bluish Brazil brilliant cut brittle Crystal system brown Burma Myanmar cabochons Calcite called carats cat's-eye Chalcedony Chemical composition chrysoberyl Chrysoprase Citrine Cleavage perfect Color of streak colorless Conchoidal coral Crystal system dark Density Deposits are found diamond Diopside Dispersion double refraction emerald faceted stones Fluorescence Fluorite Fracture garnet gemstones glass green greenish Hambergite hardness imitations inclusions jade Jadeite jasper jewelry Lapis lazuli layer light Madagascar Malachite minerals Monoclinic Myanmar Namibia necklace Nephrite Obsidian onyx opal orange Orthorhombic partly polished Peridot pink Pleochroism Possibilities for Confusion Prasiolite precious beryl Pyrope Refractive index Rhodochrosite Rock crystal Rose quartz rough ruby sapphire Sinhalite Smoky quartz spinel Sri Lanka streak white synthetic Tanzanite Tiger's-eye tourmaline trade Transparent to opaque Transparent to translucent Trigonal Tugtupite Turquoise violet vitreous luster weak White Mohs yellow yellow-green yellowish Zircon