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!
58:48
Understanding the Origin of Natural Diamonds | GIA Knowledge Sessions Webinar Series
1:04:18
Geology 102: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
53:03
Quantifying Diamond Fluorescence and Its Visual Impact | 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
57:46
Tools of the Trade | GIA Knowledge Sessions Webinar Series
1:11:32