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 Hardness: 9 Chemical Comp: AL2O3 Density: 4.00 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 are called Color-change Star Sapphires. Top-quality sapphires are extremely rare.
Beauty, magnificent colour, 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. Add a map to your own listings. The item "STAR SAPPHIRE 6 RAY 5.14 CTS NATURAL SRI LANKA GEMSTON 13915" is in sale since Saturday, August 25, 2018.This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Sapphire\Natural Sapphires". The seller is "cresla" and is located in Colombo. This item can be shipped worldwide.