Asterism in gemology refers to a kind of special optic phenomenon that can be seen in several gems. It is caused by the dense inclusions of tiny fibres of rutile (also known as “silk”). The stars are caused by the light reflecting from needle-like inclusions of rutile aligned perpendicular to the rays of the star.
Evaluating a star gemstone depends on the clarity of the star. Generally the star must be viewed using a single source of light. Moving the light back and forth should cause the star to move across the stone’s surface. The rays of the star should be evenly distributed and relatively straight.
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