star sapphire

star sapphire

noun
a sapphire, cut cabochon, exhibiting asterism in the form of a colorless six-rayed star.

Origin:
1795–1805

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World English Dictionary
star sapphire
 
n
a sapphire showing a starlike figure in reflected light because of its crystalline structure

Collins English Dictionary - Complete & Unabridged 10th Edition
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