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
1:10:32
The Microworld of Gemstones | GIA Knowledge Sessions Webinar Series
57:46
Tools of the Trade | GIA Knowledge Sessions Webinar Series
1:39:14
Tucson Gem & Mineral Show 2023 Main Event! w/ Black Opal Direct, Agates, Minerals, & Crystals part1
55:29
COMETA Colloquium 25/11/2024 - Thea Aarrestad - Detecting the rare and complex
1:04:18
Geology 102: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
59:02