Tangled up in Neon Blue: A Review of Paraíba Tourmaline | GIA Knowledge Sessions Webinar Series
1:08:31
Red Gemstones: History, Lore and Gemology | GIA Knowledge Sessions Webinar Series
1:05:21
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series
46:00
Tourmaline as a Gemstone
1:09:59
Microfeatures of Gems: Geologic Implications | GIA Knowledge Sessions Webinar Series
1:07:41
A Look at Kimberlites: The Volcanoes that Carry Diamonds | GIA Knowledge Sessions Webinar Series
1:12:13
Geology 101: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
1:05:05
Playing the Blues: An Overview of Sapphire Treatment | GIA Knowledge Sessions Webinar Series
1:10:32