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
1:01:42
Identifying Mineral Inclusions in Diamonds | GIA Knowledge Sessions Webinar Series
58:48
Understanding the Origin of Natural Diamonds | 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
46:04
Inside The Gem Trade: Pigeon’s Blood Ruby | In Search Of Precious Stones | Ep 2/4 | CNA Documentary
1:05:12
Rough Diamonds: Natural Crystal Shapes & Surface Features | GIA Knowledge Sessions Webinar Series
57:46