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What is Spring 1984 Gems & Gemology about?

Cover 1 Table of Contents 2 Editorial: Basil W. Anderson 1901-1984 4 The Gems & Gemology Most Valuable Article Award 5 The Santa Terezinha de Goiás Emerald Deposit 7 Pitfalls in Color Grading Diamonds by Machine 17 The Early History of Gemstone Treatments 25 'Cobalt-Blue' Gem Spinels 37 Lepidolite with Simulated Matrix 45 Gem Trade Lab Notes 48 Gemological Abstracts 54 Gem News 61 Book Reviews 64 Basil Anderson,Santa Terezinha,Brazil,diamond grading,color grading,gem treatments,spinel,lepidolite,gem news,lab notes Spring 1984 Gems & Gemology

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Adobe Acrobat 7.0

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EN