What is the Best Color of a Star Sapphire? ![]() The best cabochons are smooth with high domes and have good symmetry. If a star sapphire is less transparent, translucent or opaque it is cut as a cabochon to show off and support the start effect with the six rays. In corundum, which is the structure of sapphire, stars usually have six rays. The number of rays relates to the gems crystal structure. The formation of all gemstones are truly amazing, but to think that the chatoyant bands from the sapphire cross in the center in several different directions to create rays and suddenly a star is born, well, that is truly Mother Nature at her best, or if you want to be technical, asterism. ![]() I have been lucky enough to get some stunning star sapphires set in gorgeous rings lately, and I have always been a bit obsessed by the star sapphire and how it is formed and the phenomena of it. It’s so hard for me to pick gemstones that are my favorite, because truth be told, I love them all.
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