Topaz vs Tourmaline
Topaz is harder (Mohs 8) than Tourmaline (Mohs 7–7.5), so it resists scratching better.
Their refractive indices are close (1.609–1.643 vs 1.624–1.644), so combine RI with SG, optic character, or inclusions to separate them.
Topaz is denser (SG 3.53 vs 3.06); a topaz of the same size weighs about 15% more.
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| Property | Topaz | Tourmaline |
|---|---|---|
| Species / material | Topaz | Tourmaline |
| Mohs hardness | 8 | 7–7.5 |
| Refractive index | 1.609–1.643 | 1.624–1.644 |
| Specific gravity | 3.53 | 3.06 |
| Crystal system | Orthorhombic | Trigonal |
| Birefringence | 0.008–0.010 | 0.014–0.021 |
Values are typical ranges from standard gemmological references; individual stones can vary.
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