cat's-eye


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cat's-eye,

gemstone that displays a thin band of reflected light on its surface when cut as a cabochon. Its name is derived from its supposed resemblance to the eye of a cat. The optical effect, known as chatoyancy, is caused by the reflection of light from very thin, closely spaced filaments in parallel arrangement within the stone. True cat's-eye, a variety of chrysoberylchrysoberyl
[Gr.,=golden beryl], a beryllium aluminate used as a gem. It has a vitreous luster and is transparent to translucent. The more valuable cat's-eye is a variety of chrysoberyl. Another variety, alexandrite, was first discovered in the Ural Mts.
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 from Sri Lanka and Brazil, is the most valuable, but some quartz, tourmaline, and a few other minerals that display chatoyancy are also used as gems. A golden-yellow species called tiger's-eye is a form of quartz that contains crocidolite asbestos.
References in periodicals archive ?
Origin of the cat's-eye effect in heat-treated zircons from Sri Lanka.
While these studies concentrated on the bright line(s) of the cat's-eye or star, the author is not aware of any explanations in the literature for the coffee-and-cream effect in chatoyant cabochons.
This summer the black plastic cat's-eye has been updated with tinted lenses in pastel hues and rhinestone trim.
The coloured cat's-eyes will switch off when lights are green but flash twice every second on amber until they turn to red.
A WOMAN motorcyclist, badly injured 10 years ago when her machine hit a cat's-eye, has won pounds 275,000 compensation.
Accessories included feather boas, beaded choker necklaces, fringed triangular stoles, drawstring bags, flowers in the hair, rhinestone tiaras, sequin tube tops and decorative cat's-eye glasses for that studious-about-style look.
Skinny wraps, '50s cat's-eye shapes, bright colors, matte metals, oversize ovals, wire rectangles instead of round - they're all major looks under this summer's sun.
Since this suit is modest and comfy, it's great for volleyball and swimming laps, but you can quickly glam it up with a pair of high-heeled sandals that show your painted toenails, cat's-eye sunglasses, big hair and red lipstick.