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Calcimator

Refractive Index Calculator

Interpret RI measurement and birefringence for gemstone identification against a reference database.

Inputs

Results

Best Match

Amethyst/Quartz

All MatchesAmethyst/Quartz
Optic CharacterAnisotropic (DR)
RI Low1.54
RI High1.55
Birefringence0.01
How to Use This Calculator
  1. Place the gemstone on a refractometer and record the RI Reading from the shadow edge.
  2. If the stone shows birefringence, record both readings to calculate the Birefringence value.
  3. Review the Best Match — the gem identification most consistent with your RI reading.
  4. Check All Matches to see other possibilities within the RI range.
  5. Use Optic Character (isotropic vs anisotropic) to narrow identification further.
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