100% Natural - Not treated in any way.
Rare Collectors Gem.
Suitable for Museums,Institutions and Students of Gemology.
Beautiful sharp Star effect.
Among the Rarest of gemstones.
Asterism (or Ray Effect) is best seen in Bright Sunlight or by focussing a Flashlight on the face of the gem.
Refractive Index: 1.759-1.778
Chemical Comp: AL2O3
Crystal Group: Hexagonal
12 Rayed Star Sapphires display a 12 rayed star By light reflecting off the silky crystallizations of retile inside called asterism. Star Sapphires belong to the Corundum family and are translucent to opaque.12 Rayed Stars are extremely rare and are sought-after by collectors.