100% Natural - Not treated in any way. Beautiful Center-stone for an engagement Ring. Will make a Gorgeous Ring or Pendent accented with Diamonds. Beautiful sharp Star effect. A Gem of Lasting Beauty. Asterism (or Ray Effect) is best seen in Bright Sunlight or by focusing a Flashlight on the face of the gem.
Refractive Index: 1.759-1.778
Chemical Comp: AL2O3
Crystal Group: Hexagonal
Star Sapphires display a 6 rayed star - By light reflecting off the silky crystallizations of rutile inside called asterism. Star Sapphires comes in a range of colors but the finer Blues, Reds, Green yellow orange and Padparaschas are extremely rare. Some color-change Corundum also displays asterism, and is called Color-change Star Sapphires. Top-quality sapphires are extremely rare. Beauty, magnificent color, transparency, and durability are the main features. Color and asterism determines the value of a star sapphire. Sri Lanka is known for the finest and the largest sapphires in the world.