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Does anyone know a crystal with refractive index of water?

  1. Dec 9, 2009 #1
    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?
  2. jcsd
  3. Dec 9, 2009 #2
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