![]() ![]() ![]() Heat treatment for color and clarity enhancement was established in Thailand. Thai locals are specialized in polishing colored stones with globally recognized and outstanding skills. Gems is derived from.īangkok, Thailand is of the worlds biggest trading hubs for colored stones including, buying, selling, polishing and enhancement treatments. The name “corundum” originates from the Tamil-Dravidian word Kurundam, as well as in sanskrit as Kuruvinda. Corundum has a hardness of 9 on the Moh’s scale making it a very hard material, just below diamond with a hardness of 10. Therefore sapphires come in a wide range of colors from red (Ruby), blue, green, purple, pink, orange, etc depending on what transition metal is present. Corundum is a crystalline form of aluminium oxide and its color is due to its typical traces of iron, titanium, vanadium and chromium. ![]()
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