Playing the Blues: An Overview of Sapphire Treatment | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:05:05 2 years ago 14 319 Скачать Далее
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:05:21 3 years ago 16 606 Скачать Далее
The Sapphires of Montana | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 59:02 3 years ago 13 175 Скачать Далее
Geology 101: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:12:13 4 years ago 105 159 Скачать Далее
Tangled up in Neon Blue: A Review of Paraíba Tourmaline | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:07:14 3 years ago 14 213 Скачать Далее
Highlights from Gems & Gemology: Spring 2021 Issue | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 58:24 2 years ago 3 453 Скачать Далее
Geology 102: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:04:18 3 years ago 19 425 Скачать Далее
Furnaces, Fluxes and Filling: A Review of Ruby Treatment | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:04:54 3 years ago 12 714 Скачать Далее
Unusual Phenomenal Colored Stones | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 53:11 2 years ago 10 895 Скачать Далее
Natural Blue Diamonds | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 58:09 3 years ago 6 699 Скачать Далее
Rough Diamonds: Natural Crystal Shapes & Surface Features | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:05:12 3 years ago 42 437 Скачать Далее
Rubies: Connecting Sources, Treatment and Science | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:01:30 4 years ago 15 454 Скачать Далее
