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Rubies & Sapphires, Fourth Edition
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Gemstones of the World: Newly Revised Fifth Edition
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Gems, Sixth Edition 6th Edition by Michael O’Donoghue (Editor)
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Jade – History and Treatment (PDF & VIDEO)
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Diamonds from Kalimantan Webinar (PDF & VIDEO)
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Jade – History and Treatment (Video ONLY )
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Diamonds from Kalimantan Webinar (Video only)
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Diamond from Kalimantan (PDF ONLY )
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Diamond Grading ABC The Manual.
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