Emmanuel Fritsch: “‘Boehmite Needles’ in Corundum Are Rose Channels”
21:20
Aaron Palke: "Unraveling the Causes of Color in Blue Spinels”
22:47
Martin Steinbach: “An Overview of Asteriated Gems”
17:42
Heat Treating Montana Sapphire
46:04
Inside The Gem Trade: Pigeon’s Blood Ruby | In Search Of Precious Stones | Ep 2/4 | CNA Documentary
17:21
Gemology: Corundum 1
53:17
Gem-A Live: Flux-healed Ruby
32:11
Barbara Dutrow (keynote): “Tourmaline and Geologic Evolution”
10:10