Black with Golden 6 Rays. The Standard For Star Sapphires. Ideally, the star in a star sapphire should be perfectly centered when viewed from directly above, with each ray of equal length. The rays should be bright, sharp, and clearly definednot blurry or fuzzyand they should reach from the crown of the cabochon to the base without interruption.Star sapphires occur in almost every color seen in transparent sapphires, although yellow, orange, and green star sapphires are very uncommon. The optical phenomenon responsible for star sapphires shimmering rays is called asterism, from the Latin word astrum, for star.
Asterism is caused by small needle-like inclusions of the mineral rutile. Black star sapphires owe their stars and their dark color to included crystals of the shiny mineral hematite. A black star sapphire with a clear star. Clarity in star sapphires is a complicated issue.
The ideal star sapphire would be entirely transparent, but the rutile silk that causes the star phenomenon ensures that every star sapphire is to some degree included. Fine star sapphires must have enough silk for a bright, well-defined star, without compromising the stones transparency. The best stones are translucent to semi-transparent. Color saturation decreases as opacity increases, so while opaque star sapphires may have very bright, well-defined stars, their color can be dull and unattractive. You can be assured of receiving exactly what you order.
Since our Gems come directly from the mines to our factory, our gemstones are guaranteed to be natural. Your satisfaction is our most important asset. The item "13.63Cts SPECTACULAR Hi-End Sparkling Gem Natural 6 Rays Black STAR SAPPHIRE" is in sale since Sunday, January 13, 2019. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Sapphire\Natural Sapphires". The seller is "a2zeshoppee" and is located in Bangrak, BANGKOK, Thailand.
This item can be shipped worldwide.