Gem-A Live: Composite Gemstones
1:11:00
Gem-A Live: Fluorescence
51:31
Gem-A Live: Introduction to Diamonds
53:17
Gem-A Live: Flux-healed Ruby
46:48
Three Precious Gems: Rubies, Emeralds, Sapphires
46:00
Tourmaline as a Gemstone
43:06
Ten Exotic and Phenomenal Gemstones
5:49
How Hydrothermal Emeralds are Created
52:01