1. 
   cat's eye
   General term for several varieties of gemstones which when viewed in a certain direction and light display a streak, likened to a cat's eye. The effect is a result of a fibrous inclusion, such as asbestos, naturally occurring within the gem, and is enhanced by a smooth cabochon cut (see jewel cuttin...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   Cat's-eye
   Cat's'-eye` (kăts'ī`) noun (Min.) A variety of quartz or chalcedony, exhibiting opalescent reflections from within, like the eye of a cat. The name is given to other gems affording like effects, esp. the chrysoberyl.
   Found op http://www.encyclo.co.uk/webster/C/38
   
   
3. 
   cat's-eye
   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 par...
   Found op http://www.infoplease.com/ce6/sci/A0810892.html
   
   

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