This is the seventh edition of a book which has been for years the "bible" of professional and amateur gemmologists, as well as retail jewellers. Originally written by Robert Webster, an expert who dedicated most of his life to the subject, this edition has been completely revised and updated by E. Alan Jobbins, Keeper of Minerals and Gemstones at the Geological Museum in London for 35 years. It includes a comprehensive glossary on all aspects of gemstones and the terms associated with them, and sections on manufactured gems, the enhancement of gem materials, and the precautions necessary to avoid damage to gemstones and jewellery during manufacturing, repairs, and cleaning.
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Preface to Fifth Edition
Price of pearls Calculations for 221
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absorption acid Alexandrite almandine Amber Anatase Andalusite Apatite Aquamarine atomic Australia Axinite bands Beryl blue Brazil brown Calcite Canada carat Cassiterite Chalcedony chemical chrysoberyl colour colourless corundum ct in ct cubic Danburite Datolite Demantoid diamond diopside Dioptase doublet Enstatite Epidote Euclase facets feldspar ﬂuorescence Fluorite gemstones Germany glass grains grams green grossular heat hematite Hessonite idocrase inclusions India jade Jadeite jewellery Kornerupine Kyanite L:W prop lapis lazuli light liquid Madagascar Malachite material metal Mexico mineral misnomer Monoclinic moonstone Myanmar name applied Namibia nephrite Norway opal opaque ounces pale pearls peridot Phenakite pink produced pyrope quartz reﬂected refractive index rhodonite rock crystal ruby Russia rutile sapphire Scapolite serpentine Sinhalite South Africa spectrum is due Sphene Spinel Spodumene Sri Lanka stones surface synthetic emerald Tanzania topaz tourmaline turquoise USA Arizona USA California USA Maine violet yellow Zimbabwe Zircon Zoisite