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- Q747746 subject Q7228288.
- Q747746 abstract "Asterism (from Ancient Greek: ἀστήρ star), or star stone, is a name applied to the phenomenon of gemstones exhibiting a luminous star-like shape when cut en cabochon. The typical asteria is the star sapphire, generally a bluish-grey corundum, milky or opalescent, with a star of six rays. In red corundum the stellate reflection is less common, and hence the star-ruby occasionally found with the star-sapphire in Sri Lanka is among the most valued of "fancy stones". When the radiation is shown by yellow corundum, the stone is called star-topaz. Cymophane, the chatoyant chrysoberyl known as cat's eye, may also be asteriated. In all these cases the asterism is due to the reflection of light from twin-lamellae or from fine tubular cavities or thin enclosures definitely arranged in the stone. The astrion of Pliny the Elder is believed to have been a moonstone, since it is described as a colourless stone from India having within it the appearance of a star shining with the light of the moon. Star-stones were formerly regarded with much superstition.".
- Q747746 thumbnail Star-Saphire.jpg?width=300.
- Q747746 wikiPageWikiLink Q105368.
- Q747746 wikiPageWikiLink Q1068275.
- Q747746 wikiPageWikiLink Q127583.
- Q747746 wikiPageWikiLink Q131777.
- Q747746 wikiPageWikiLink Q134985.
- Q747746 wikiPageWikiLink Q14506045.
- Q747746 wikiPageWikiLink Q191310.
- Q747746 wikiPageWikiLink Q193521.
- Q747746 wikiPageWikiLink Q316671.
- Q747746 wikiPageWikiLink Q320603.
- Q747746 wikiPageWikiLink Q422179.
- Q747746 wikiPageWikiLink Q430034.
- Q747746 wikiPageWikiLink Q43010.
- Q747746 wikiPageWikiLink Q43088.
- Q747746 wikiPageWikiLink Q615008.
- Q747746 wikiPageWikiLink Q6481697.
- Q747746 wikiPageWikiLink Q668.
- Q747746 wikiPageWikiLink Q7228288.
- Q747746 wikiPageWikiLink Q82778.
- Q747746 wikiPageWikiLink Q83437.
- Q747746 wikiPageWikiLink Q854.
- Q747746 wikiPageWikiLink Q902950.
- Q747746 comment "Asterism (from Ancient Greek: ἀστήρ star), or star stone, is a name applied to the phenomenon of gemstones exhibiting a luminous star-like shape when cut en cabochon. The typical asteria is the star sapphire, generally a bluish-grey corundum, milky or opalescent, with a star of six rays. In red corundum the stellate reflection is less common, and hence the star-ruby occasionally found with the star-sapphire in Sri Lanka is among the most valued of "fancy stones".".
- Q747746 label "Asterism (gemology)".
- Q747746 depiction Star-Saphire.jpg.