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
1:10:32
The Microworld of Gemstones | GIA Knowledge Sessions Webinar Series
15:09
Episode 11: Phenomenal Gemstones
1:04:54
Furnaces, Fluxes and Filling: A Review of Ruby Treatment | GIA Knowledge Sessions Webinar Series
1:26:52
A Comparison of Diamonds and Colored Stones | GIA Knowledge Sessions Webinar Series
19:39
All About Phenomenal Gemstones: Star Sapphire, Labradorite, More!
59:02
The Sapphires of Montana | GIA Knowledge Sessions Webinar Series
55:06