Diamond vs Moissanite
Diamond is harder (Mohs 10) than Moissanite (Mohs 9.25), so it resists scratching better.
Moissanite has the higher refractive index (2.648–2.691 vs 2.417), which a refractometer (over-the-limit reading) can use to separate them.
Diamond is denser (SG 3.52 vs 3.22); a diamond of the same size weighs about 9% more.
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| Property | Diamond | Moissanite |
|---|---|---|
| Species / material | Diamond (carbon) | Silicon carbide |
| Mohs hardness | 10 | 9.25 |
| Refractive index | 2.417 | 2.648–2.691 |
| Specific gravity | 3.52 | 3.22 |
| Crystal system | Cubic | Hexagonal |
| Birefringence | None (isotropic) | 0.043 |
Values are typical ranges from standard gemmological references; individual stones can vary.
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