Star Ruby and Diamond Ring.
Star Ruby and Diamond Ring.

Asterism is an optical phenomenon. The reflection of light rays on a gemstone, cut en cabochon, forms a star. Dense, fine parallel inclusions cause light to reflect as a ray perpendicular to these inclusions. These stars can have six rays, four rays and, rarely, twelve rays. When the light reflects as only one ray that phenomenon is called a cat’s-eye.

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