Sapphire is a variety of the mineral Corundum it is the same material as Ruby, consisting of aluminum oxide with trace amounts of elements such as iron, titanium, cobalt, lead, chromium, vanadium, magnesium, boron, and silicon it has a hardness of 9 on the Mohs scale. It has a Refractive Index of 1.76 – 1.77. This beautiful piece of Sapphire from The Umba River in Tanzania weighs 6.77 cts and measures 13x8x7mm and has some viels.