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Cron vanessa
Dr. Laurent E. Cartier
Dr. Michael S. Krzemnicki
Kathia Pinckernelle
Kathia Pinckernelle
Michael Schmitt
SSEF
Swiss Gemmological Institute SSEF
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Introduction to Pearls by SSEF
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Introduction to Sapphires by SSEF
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Introduction to Emeralds by SSEF
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Introduction to Rubies by SSEF
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Introduction to Diamonds by SSEF
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Introduction to Spinels by SSEF
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Introduction to Garnets by SSEF
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Introduction to Tourmalines by SSEF
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Introduction to Opals by SSEF
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