Topaz vs Moissanite
Moissanite is harder (Mohs 9.25) than Topaz (Mohs 8), so it resists scratching better.
Moissanite has the higher refractive index (2.648–2.691 vs 1.609–1.643), which a refractometer (over-the-limit reading) can use to separate them.
Topaz is denser (SG 3.53 vs 3.22); a topaz of the same size weighs about 10% more.
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| Property | Topaz | Moissanite |
|---|---|---|
| Species / material | Topaz | Silicon carbide |
| Mohs hardness | 8 | 9.25 |
| Refractive index | 1.609–1.643 | 2.648–2.691 |
| Specific gravity | 3.53 | 3.22 |
| Crystal system | Orthorhombic | Hexagonal |
| Birefringence | 0.008–0.010 | 0.043 |
Values are typical ranges from standard gemmological references; individual stones can vary.
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