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CIBJO Guide: Classifying Natural Pearls and Cultured Pearls
https://gemologyonline.com/Forum/phpBB2/viewtopic.php?f=70&t=26058
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Author:  Barbra Voltaire, FGG [ Thu Feb 18, 2021 1:41 pm ]
Post subject:  CIBJO Guide: Classifying Natural Pearls and Cultured Pearls

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