![]() Asterism is caused by light reflecting off of parallel bundles of tiny hollow tubes or fibrous crystals of another mineral inside the gemstone. It is an interesting member of the gem kingdom because it displays an optical phenomenon called asterism. Star sapphire is considered a phenomenal stone. This platinum ring has a round cabochon star sapphire as the centerpiece, accented with round brilliant cut diamonds set in "leaf-like" prongs, and baguette cut diamonds fanned on the sides of the shank.
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