Wim Vertriest: “GIA’s Field Gemology Program and Origin Determination” GIA (Gemological Institute of America) 22:24 5 years ago 2 460 Скачать Далее
Field Gemology: A Research Based Approach to Origin Determination | GIA Knowledge Sessions Webinar GIA (Gemological Institute of America) 37:34 4 years ago 8 045 Скачать Далее
Gemstone Country of Origin Reporting | GIA Guest Lecture Series GIA (Gemological Institute of America) 50:44 4 years ago 4 212 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 2 988 Скачать Далее
A Decade of Mozambican Rubies | GIA Guest Lecture Series GIA (Gemological Institute of America) 1:21:10 4 years ago 27 931 Скачать Далее
Emerald Sources: The Grass is Greener on the Other Side | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:03:33 3 years ago 12 680 Скачать Далее
ICA Congress 2023 - Field Gemology ICA International Colored Gemstone Association 33:32 1 year ago 44 Скачать Далее
Untold Stories from GIA Field Gemology Expeditions | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:16:41 4 years ago 6 575 Скачать Далее
Exploring Field Gemology with GIA - Episode 1 Rapaport Jewelry Pro 46:33 2 months ago 58 Скачать Далее
Rubies: Connecting Sources, Treatment and Science | GIA Knowledge Sessions Webinar Series GIA (Gemological Institute of America) 1:01:30 4 years ago 15 442 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 105 120 Скачать Далее
Introduction to GIA for the Trade (Full Version) GIA (Gemological Institute of America) 6:51 6 years ago 1 801 Скачать Далее
GIA Gemological Laboratory by GIA GIA (Gemological Institute of America) 5:46 8 years ago 147 355 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 19 412 Скачать Далее