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Laboratory-Grown Diamonds from China | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 59:04 4 years ago 12 767 Скачать Далее
Green Gemstones: History, Lore and Gemology | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 55:47 3 years ago 9 622 Скачать Далее
Untold Stories from GIA Field Gemology Expeditions (Part II) | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 58:21 3 years ago 3 023 Скачать Далее
Laboratory-Grown Colored Gemstones: Crystal Growth Methods | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 58:05 3 years ago 8 648 Скачать Далее