"Hunting for spinels in Vietnam" by GIA
How to Shape & Polish Corundum - JOOLTOOL
Rubies at the Bangkok Gem Show
Lab-Grown Rubies and Sapphires: Flux Vs. Flame Fusion
CUTTING A ROUGH SPINEL IN YANGON MYANMAR OCT 2012
13 Rarest Gemstones and Minerals Ever Seen
Surface Sapphire Mining in Southern Sri Lanka (3 of 3)
Gem Cutting - Lake&Co. Archive