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Asterism gemstone

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Star sapphire, also known as "star" in the trade. Cabochon-cut star sapphire gemstones characteristically shows a six-rayed star. Although stars can occur in a range of colors many stars are grayish or dark and the supply of fine stones is always limited. This natural star sapphire features strong asterism phenomena, when fibrous inclusions align on all of the crystal axes, the cat'seye effect can appear in two or three directions at once.
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Asterism Gemstone

Star sapphire, also known as "star" in the trade. Cabochon-cut star sapphire gemstones characteristically shows a six-rayed star. Although stars can occur in a range of colors many stars are grayish or dark and the supply of fine stones is always limited. This natural star sapphire features strong asterism phenomena, when fibrous inclusions align on all of the crystal axes, the cat'seye effect can appear in two or three directions at once.

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Rare Double-star Blue Sapphire. Polished as an oval cabochon with a high dome, this sapphire of classic Sri Lankan cornflower blue, possesses a very unusual form of asterism: when the stone is illuminated with a single point light source, two superimposed six-rayed stars appear. The rays of one star are almost parallel to, and just to the side of, the other.
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Bonhams : Rare Double-star Blue Sapphire--A Published Gem

Rare Double-star Blue Sapphire--A Published Gem Sri Lanka Polished as an oval cabochon with a high dome, this sapphire of classic Sri Lankan cornflower blue, possesses a very unusual form of asterism: when the stone is illuminated with a single point light source, two superimposed six-rayed stars appear. The rays of one star are almost parallel to, and just to the side of, the other.

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Asterism, or the “star stone” effect, occurs rarely in quartz but is especially striking in rose quartzes. Since these gems may contain microscopic inclusions of rutile needles, cabs can sometimes show a six-rayed star when properly cut.    Photo Credits: IG 📷 http://superseven.cn/
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Asterism, or the “star stone” effect, occurs rarely in quartz but is especially striking in rose quartzes. Since these gems may contain microscopic inclusions of rutile needles, cabs can sometimes show a six-rayed star when properly cut. Photo Credits: IG 📷 http://superseven.cn/

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PHENOMENAL GEMSTONE: STAR ROSE QUARTZ - 31.313 CT.. Brazil. ... | Lot #52301 | Heritage Auctions

PHENOMENAL GEMSTONE: STAR ROSE QUARTZ - 31.313 CT. Brazil This medium-pink, round cabochon Star Rose Quartz - Available at 2014 May 4 Nature & Science...

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Bonhams : Purple Star Sapphire

Purple Star Sapphire Sri Lanka This strong unusual sapphire is notable for its strong violet purple hue infrequently seen amongst sapphires. The asterism is both strong and central and the stone is of a suitable depth for ease of mounting. Weighing approximately 3.79 carats and measuring 10.8 x 9.0 x 3.5mm

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Not all stars can be found in Hollywood or Bollywood. Donated to the Smithsonian in 1965 by advertising mogul Rosser Reeves (who among other things coined the advertising jingle 'M & M's, they melt in your mouth, not in your hands') this stunning 138.70ct Sri Lankan Star Ruby is perhaps one of the finest star rubies you will ever see. Currently illuminating the pages of The Handbook of Gemmology and again photographed by Tino Hammid
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Ruby Star

Not all stars can be found in Hollywood or Bollywood. Donated to the Smithsonian in 1965 by advertising mogul Rosser Reeves (who among other things coined the advertising jingle 'M & M's, they melt in your mouth, not in your hands') this stunning 138.70ct Sri Lankan Star Ruby is perhaps one of the finest star rubies you will ever see. Currently illuminating the pages of The Handbook of Gemmology and again photographed by Tino Hammid

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