Laboratory-Grown Colored Gemstones: Crystal Growth Methods | GIA Knowledge Sessions Webinar Series
54:59
Superstitions Surrounding Gems and Jewelry | GIA Knowledge Sessions Webinar Series
1:05:21
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series
53:11
Unusual Phenomenal Colored Stones | GIA Knowledge Sessions Webinar Series
8:39
I Cut a Raw 10 Carat Montana Sapphire Into a Beautiful Gemstone
1:12:00
Gem-A Live: Man-made Stones Explained
43:39
33. How to Identify Rocks
1:05:12
Rough Diamonds: Natural Crystal Shapes & Surface Features | GIA Knowledge Sessions Webinar Series
11:04