![]() ![]() Clarity (clarity) in star sapphires is a complicated problem. The star of the black sapphire owes their star and its dark color includes shiny hematite mineral crystals. The optical phenomenon responsible for the shimmering rays of star sapphires is called asterism, from the Latin word astrum, for "star." Asterism is caused by frail inclusion like a small needle. ![]() Sapphire Star appears in almost every color seen in transparent sapphires, although yellow, orange, and green star sapphires are very rare. The rays must be bright, sharp and clear - not blurry or blurry - and must reach from the crown of the cabochon to the bottom without interference. ![]() Ideally, Star Sapphire must be perfectly centered when viewed from just above, with each ray of the same length. ![]()
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