Gem-A Live: Introduction to Diamonds
1:04:25
Gem-A Live: Beryllium Diffusion in Sapphire
49:36
The Diamond Story
1:12:00
Gem-A Live: Man-made Stones Explained
1:03:52
Laboratory-Grown Diamonds: Updates and Identification | GIA Knowledge Sessions Webinar Series
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
41:44
Diamond Grading Essentials: ISG Journey Thru Gemology Online Classroom
53:17
Gem-A Live: Flux-healed Ruby
1:11:00