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What is Summer 1986 Gems & Gemology about?

Cover 1 Table of Contents 2 The Coscuez Mine: A Major Source of Colombian Emeralds 4 The Elahera Gem Field in Central Sri Lanka 17 Some Unusual Sillimanite Cat's-Eyes 33 An Examination of Four Important Gems 36 Green Glass Made of Mount Saint Helens Ash? 40 Editorial Forum 42 Gem Trade Lab Notes 45 Gem News 51 Gemological Abstracts 54 Book Reviews 63 Suggestions for Authors 65 Columbian,Emeralds;,Coscuex,Mine;,Elahera,Gem,Field;,Central,Sri,Lanka;,Unusual,Sillimanite,Cat's-Eyes;,Star,of,Bombay,Sapphire;,Portuguese,Diamond;,Marie,Antoinette,Earrings;,Green,Glass,from,Mt.,St.,Helens,Ash;,Editorial,Forum;,Gem,Trade,Lab,Notes;,Gem,News;,Abstracts;,Book,Reviews;,Suggestions,for,Authors Summer 1986 Gems & Gemology

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