Category:Asterism (gemmology)

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English: An asterism is an optical phenomenon of an enhanced reflective area in the shape of a "star" on the surface of a cabochon-cut stone. Some stones' stars are seen by light striking the front of the stone (epiasterism), while others (mainly rose quartz) can only be seen when the stone is held to the light (diasterism). The number of rays composing the star are usually either four or six in natural stones; up to 16 rays have been seen in treated and man-made material.
asterism 
ornamental stones that exhibit a luminous star when cut en cabochon
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Instance of optical phenomenon
Subclass of lustre
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asterismo (es); Astérisme (gemmologie) (fr); Астеризм (минералогия) (ru); Asterismus (de); asterismo (gemologia) (pt); 星芒 (寶石學) (zh); Астеризам (ефекат) (sr); スター効果 (ja); Asterism (sv); asterisme (nn); אסטריזם (he); Asterisme (nl); 星光效應 (zh-hant); Asterismo (io); Asteryzm (mineralogia) (pl); Αστερισμός (ορυκτολογία) (el); asterism (en); 星光效应 (zh-cn); 星光效应 (zh-hans); Астеризм (мінералогія) (uk) brillo en forma de estrella en minerales tallados en cabujón (es); ornamental stones that exhibit a luminous star when cut en cabochon (en); sternförmige Lichtreflexe an Edel- und Schmuckstein (de); mineralogie (nl) Астеризм (в минералогии) (ru); Lichtstern, Sternenglanz (de); Astérisme (Gemmologie), Asterisme (gemmologie) (fr); Астеризм (природне явище) (uk); 星彩性 (zh)

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