Rubies: Connecting Sources, Treatment and Science | GIA Knowledge Sessions Webinar Series
1:10:25
Fascinating World of Pearls and Shells | GIA Knowledge Sessions Webinar Series
1:00:13
An Exclusive View of the World's Biggest Jade Auction | GIA Knowledge Sessions Webinar Series
46:48
Three Precious Gems: Rubies, Emeralds, Sapphires
1:05:21
Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series
1:05:05
Playing the Blues: An Overview of Sapphire Treatment | GIA Knowledge Sessions Webinar Series
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
1:04:54
Furnaces, Fluxes and Filling: A Review of Ruby Treatment | GIA Knowledge Sessions Webinar Series
59:02