Unusual Phenomenal Colored Stones | GIA Knowledge Sessions Webinar Series
1:05:05
Playing the Blues: An Overview of Sapphire Treatment | GIA Knowledge Sessions Webinar Series
19:39
All About Phenomenal Gemstones: Star Sapphire, Labradorite, More!
1:05:21
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series
57:46
Tools of the Trade | GIA Knowledge Sessions Webinar Series
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
55:29
COMETA Colloquium 25/11/2024 - Thea Aarrestad - Detecting the rare and complex
52:24
Discovering the Rare King of Sapphires: The Padparadscha (Zooming into Gems Webinar)
46:04