Product details
100% Natural – Not treated in any way.
Rare Collectors Gem
Suitable for Museums,Institutions and Students of Gemology.
Will make a Gorgeous Ring or Pendent accented with Diamonds.
Beautiful sharp Star effect.
Among the Rarest of gemstones.
Ployasterism – Rare Multiple Starts displayed in Star Sapphires
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
Hardness: 9
Chemical Comp: AL2O3
Density: 4.00
Crystal Group: Hexagonal
Double-star Sapphires display a double star – By light reflecting off the silky crystallizations of rutile inside called asterism. Double-Stars display twin asterism –this rare feature is called Poly-Asterism, Please see Gemological details, Double –Stars are much sought-after by Gemological Institutions and Students of Gemology and are extremely rare.
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