Hello,
Why are there so many different values for the refractive index of a specific gemstone on websites? Which website gives the true refractive index range? If I look up the refractive index range of a gemstone on three different websites they all give different highs and lows for the range.
Welcome Richard!
This article hints at the problem.
I came across it while taking the minicourse on Gemological Tools:
Cheers!
-Troy
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