Peter Lyckberg: “Gem Pegmatites: An Update on Recent Production”
20:19
Raquel Alonso-Perez: “Multidisciplinary Approach to Emerald Sources”
22:47
Martin Steinbach: “An Overview of Asteriated Gems”
1:05:21
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series
1:28:50
Spectacular Gem Crystals: Pegmatite Pocket Formation and Survival
1:12:13
Geology 101: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
52:00
Adiós petróleo: las setas, ¡la biotecnología del futuro!
29:33
Gems of the Americas (THROWBACK NOSTALGIC) #throwback #nostalgia
19:24