Corundum is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color. Ruby is the red variety, and Sapphire is the variety that encompasses all other colors, although the most popular and valued color of Sapphire is blue. Sapphire is also only used to describe the gem variety; otherwise it is simply called Corundum. Corundum is a very hard, tough, and stable mineral. For all practical purposes, it is the hardest mineral after Diamond, making it the second hardest mineral. This stone has been Ruby colour enhanced, but may contain actual Ruby within it.
It is 1990 Cts, Oval Stone
Measures 83 X 61 X 42 mm
1.76 - 1.77 Refractive Index
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