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Chrysoberyl

From the AGTA website:

http://www.agta.org/gemstones/variation-chrysoberyl.html

 

Valued for thousands of years, chrysoberyl is a surprising gem that you'll love as much for what it does as for how it looks. Chrysoberyl is an action gem, changing and moving in response to light.  In the gem world, these special effects are known as phenomena.  The gem varieties of chrysoberyl respond to light in surprising ways.

The best-known special effect of chrysoberyl is an eye, which is displayed when certain specimens of this gem are cut in a dome shape. Cat's-eye chrysoberyl has a pupil-like band of light that sweeps across its dome. The "eye" is caused by fibrous inclusions that reflect the light in a sharply defined pattern.  The effect is uncanny and quite cat-like. Although other gem varieties can display this effect, none is as dramatic.

Fine cat's-eye chrysoberyl often also shows the "milk and honey" effect. When a bright light is directed at the side of the stone, one side of the eye will be milky white and the other remains gold. When the gemstone is rotated, the colors switch.

The color of cat's-eye chrysoberyl ranges from a honey-brown to an apple green with rich gold colors generally the most valued. The most important value factor is the strength and sharpness of the eye.

Chrysoberyl is very durable, with a Mohs hardness of 8.5.  It is an excellent gemstone for everyday wear and perfect for men’s rings. Use warm soapy water and a soft brush to clean the gemstone.


Photo Gallery: Selected Chrysoberyl's

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