Gemstones with RI 3.110

2 gemstones have a refractive index range that includes 3.110. Refractive index measures how much light bends when entering a gem — it's one of the most diagnostic properties for identification. Measured with a gemological refractometer.

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GemstoneRI RangeSG RangeCrystal SystemOptic Character
Cinnabar2.905 – 3.2568.00 – 8.20TrigonalDR_U+
Hematite2.940 – 3.2204.95 – 5.30TrigonalDR_U-
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