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.
ornamental stones that exhibit a luminous star when cut en cabochon  | |||||
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Subcategories
This category has the following 2 subcategories, out of 2 total.
S
- Star of India (gem) (2 F)
Pages in category "Asterism (gemmology)"
This category contains only the following page.
Media in category "Asterism (gemmology)"
The following 14 files are in this category, out of 14 total.
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Black-star-diopside-oval-18x1350mm-22ct-item080pe.jpg 250 × 250; 9 KB
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Diopsid - Cabochon mit Lichtstern - Indien1.jpg 1,520 × 1,100; 1.67 MB
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Diopsid - Cabochon mit Lichtstern - Indien2.jpg 1,400 × 1,000; 1.39 MB
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Diopside cabochon Inde.jpg 1,560 × 1,704; 584 KB
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Gemstone 1 at SMNH.JPG 2,048 × 1,536; 938 KB
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Gemstone 2 at SMNH.JPG 1,536 × 2,048; 832 KB
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Idahostargarnet.jpg 400 × 400; 13 KB
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National Museum of Natural History Sphere Gems.JPG 1,442 × 352; 147 KB
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Quartz rose étoilé.jpg 709 × 740; 158 KB
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Star of idaho.JPG 2,592 × 1,944; 512 KB
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Stargarnet.jpg 640 × 480; 91 KB
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Statestarquartz.jpg 160 × 169; 5 KB
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WLA hmns Star Rose Quartz.jpg 2,592 × 3,888; 2.95 MB
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