Gemstones with RI 1.675

13 gemstones have a refractive index range that includes 1.675. 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.

← All RI Values

GemstoneRI RangeSG RangeCrystal SystemOptic Character
Peridot1.654 – 1.6903.27 – 3.48OrthorhombicDR_B+
Jadeite1.654 – 1.6883.24 – 3.43AggregateAGG
Kornerupine1.660 – 1.6993.27 – 3.45OrthorhombicDR_B-
Hiddenite1.660 – 1.6763.15 – 3.21MonoclinicDR_B+
Kunzite1.660 – 1.6763.15 – 3.21MonoclinicDR_B+
Sinhalite1.665 – 1.7123.47 – 3.50OrthorhombicDR_B-
Jet1.640 – 1.6801.10 – 1.40AmorphousSR
Star Diopside1.664 – 1.7213.27 – 3.36MonoclinicDR_B-
Chrome Diopside1.664 – 1.7303.22 – 3.38MonoclinicDR_B-
Clinohumite1.625 – 1.6753.13 – 3.35MonoclinicDR_B+
Rhodochrosite1.600 – 1.8203.40 – 3.70TrigonalDR_U-
Pearl1.520 – 1.6902.60 – 2.85AggregateAGG
Malachite1.655 – 1.9093.60 – 4.05MonoclinicDR_B-
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