Gemstones with RI 1.960

2 gemstones have a refractive index range that includes 1.960. 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
Zircon1.925 – 1.9844.60 – 4.80TetragonalDR_U+
Sphene1.843 – 2.1103.45 – 3.55MonoclinicDR_B+
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