Does anyone know a crystal with refractive index of water?

AI Thread Summary
The discussion centers on identifying a crystal with a refractive index of 1.33, which causes it to become nearly invisible when submerged in water. The original poster recalls a gemologist demonstrating this effect with a ring, suggesting that cryolite may be the crystal in question. They seek information on obtaining such a crystal. Links to Wikipedia and an eBay listing for cryolite are provided for reference. The conversation highlights the unique optical properties of certain crystals and their availability.
MaxL
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When I was a little kid, I met a gemologist who showed me a cool trick with a ring he'd bought for his wife. When he submerged it in water, the crystal disappeared!

As I now know, this crystal had an index of refraction of 1.33.

Anyone know what this crystal is and/or how I can get my hands on one?
 
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Cryolite?

http://en.wikipedia.org/wiki/Cryolite

http://cgi.ebay.com/FREAKINGCAT---2.46-ct---CRYOLITE---GREENLAND_W0QQitemZ120499866185QQcmdZViewItemQQimsxZ20091205?IMSfp=TL091205011007r1225
 
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