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But isn’t their shine mostly due to the internal reflection rather than external refraction? That’s why the gems are cut angularly, to help with the internal reflection.

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TheEighthDoctor@lemmy.zip ⁨1⁩ ⁨year⁩ ago
You can only observe the external properties since you are on the outside

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- stephen01king@lemmy.zip ⁨1⁩ ⁨year⁩ ago
  By that logic, glass mirrors also work by refraction, because it refracts out of the glass before it reaches your eye.
  
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  - TheEighthDoctor@lemmy.zip ⁨1⁩ ⁨year⁩ ago
    The silver reflects tho
    
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    stephen01king@lemmy.zip ⁨1⁩ ⁨year⁩ ago
    And so does the internal surface of a diamond.
    
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