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Title: The leading authority on emeralds
Review: John Sinkankas' Emerald and Other Beryls is a must have have book for all gemologists. As Director of the Smithsonian Institute's Natural History Museum, Sinkankas' experience and knowledge on the subject is unsurpassable. As an emerald exporter myself, I have learned more about the characteristics of the gemstone from him than any other source I have looked into. Excellent information. A. Morales Bogota, Colombia
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