Understanding the Cat's Eye Effect in Gemstones
3:02
YouTubeFree Online Gemological course
Understanding the Cat's Eye Effect in Gemstones
Chatoyancy is the gemmological name given to the curious optical effect in which a band of light is reflected in certain cabochon-cut gemstones, creating an appearance similar to light bouncing off a cat's eye. Gem-A's Collection Curator, Barbara Kolator FGA DGA explains chatoyancy and highlights some of the many gems in which it can occur ...
930 viewsJun 21, 2020
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Gemstone Chatoyancy and Stars: illuminating gemstone cabochons reveals rays and stars where light is scattered by microscopic parallel crystal fibers of rutile (titanium oxide) or magnetite that grow within the different mineral species. These fibers grow to be in alignment along the axes of the crystalline structure producing the illuminated rays: 6 point star (synthetic red ruby-aluminum oxide with trace chromium), 4 point star (black diopside- calcium magnesium silicate), and a simple “tiger
Gemstone Chatoyancy and Stars: illuminating gemstone cabochons reveals rays and stars where light is scattered by microscopic parallel crystal fibers of rutile (titanium oxide) or magnetite that grow within the different mineral species. These fibers grow to be in alignment along the axes of the crystalline structure producing the illuminated rays: 6 point star (synthetic red ruby-aluminum oxide with trace chromium), 4 point star (black diopside- calcium magnesium silicate), and a simple “tiger
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