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.45 ct natural Montana Sapphire precision faceted in Missoula by Mike Soebbing Mike Soebbing (The Gemstone Man) 0:31 4 years ago 55 Далее Скачать
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Highlights from Gems & Gemology: Spring 2021 Issue | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 58:24 3 years ago 3 601 Далее Скачать
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Sapphires From Montana - A Historical, Geological, and Gemological Overview South Orange County Gem and Mineral Society 1:07:07 4 years ago 11 876 Далее Скачать
Untold Stories from GIA Field Gemology Expeditions (Part II) | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 58:21 3 years ago 3 069 Далее Скачать
