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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.
This category has only the following subcategory.
- ► Star of Asia Sapphire (2 F)
Pages in category "Asterism (gemmology)"
This category contains only the following page.
Media in category "Asterism (gemmology)"
The following 19 files are in this category, out of 19 total.
- Diopside cabochon Inde.jpg 584 KB
- Gemstone 1 at SMNH.JPG 938 KB
- Gemstone 2 at SMNH.JPG 832 KB
- Idahostargarnet.jpg 13 KB
- Quartz rose étoilé.jpg 158 KB
- Star of idaho.JPG 512 KB
- Star of India Gem.JPG 277 KB
- Star sapphire.jpg 13 KB
- Star-Saphire.jpg 8 KB
- Stargarnet.jpg 91 KB
- Starofbombay.jpg 112 KB
- Statestarquartz.jpg 5 KB
- WLA hmns Star Rose Quartz.jpg 1.74 MB