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
1:05:21
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series
57:46
Tools of the Trade | GIA Knowledge Sessions Webinar Series
1:04:18
Geology 102: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
59:02
The Sapphires of Montana | GIA Knowledge Sessions Webinar Series
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
58:48
Understanding the Origin of Natural Diamonds | GIA Knowledge Sessions Webinar Series
1:10:32