Welladura, Kahawatta, Ratnapura, Sri Lanka
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Sapphire Ring Collection

Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide Al2O3 with trace amounts of elements such as iron, titanium, chromium,copper, or magnesium.

Category: Oxide mineral

Formula: Aluminium oxide, Al2O3

Crystal system: Trigonal

Crystal class: Hexagonal scalenohedral

Mohs scale hardness: 9.0

Luster: Vitreous

Specific gravity: 4.0 ~ 4.1

 

Sapphire is the birthstone for September

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