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
58:48
Understanding the Origin of Natural Diamonds | GIA Knowledge Sessions Webinar Series
19:39
All About Phenomenal Gemstones: Star Sapphire, Labradorite, More!
57:46
Tools of the Trade | 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
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
26:16
Can you GROW an Opal?
3:00:00