Ruby vs Moissanite
Moissanite is harder (Mohs 9.25) than Ruby (Mohs 9), so it resists scratching better.
Moissanite has the higher refractive index (2.648–2.691 vs 1.762–1.770), which a refractometer (over-the-limit reading) can use to separate them.
Ruby is denser (SG 4 vs 3.22); a ruby of the same size weighs about 24% more.
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| Property | Ruby | Moissanite |
|---|---|---|
| Species / material | Corundum | Silicon carbide |
| Mohs hardness | 9 | 9.25 |
| Refractive index | 1.762–1.770 | 2.648–2.691 |
| Specific gravity | 4 | 3.22 |
| Crystal system | Trigonal | Hexagonal |
| Birefringence | 0.008–0.010 | 0.043 |
Values are typical ranges from standard gemmological references; individual stones can vary.