Asterism
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Definition
An optical phenomenon in which intersecting bands of reflected light form a star pattern — usually four- or six-rayed — across the surface of a cabochon-cut gem.
Detailed Explanation
一种光学现象，相交的反射光带在弧面切割宝石表面形成星形图案——通常为四射或六射星——横跨宝石表面。