Gem-A Live: Understanding Gemstone Species and Varieties
51:31
Gem-A Live: Introduction to Diamonds
1:12:00
Gem-A Live: Man-made Stones Explained
1:12:13
Geology 101: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series
1:01:37
Gem-A Live: Titanium Diffusion in Sapphire
46:48
Three Precious Gems: Rubies, Emeralds, Sapphires
1:11:00
Gem-A Live: Fluorescence
1:12:38
Gem-A Live: Composite Gemstones
17:17