Diamond vs Garnet (almandine)
Diamond is harder (Mohs 10) than Garnet (almandine) (Mohs 7–7.5), so it resists scratching better.
Diamond has the higher refractive index (2.417 vs 1.790), which a refractometer (over-the-limit reading) can use to separate them.
Garnet (almandine) is denser (SG 4.05 vs 3.52); a garnet (almandine) of the same size weighs about 15% more.
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| Property | Diamond | Garnet (almandine) |
|---|---|---|
| Species / material | Diamond (carbon) | Garnet |
| Mohs hardness | 10 | 7–7.5 |
| Refractive index | 2.417 | 1.790 |
| Specific gravity | 3.52 | 4.05 |
| Crystal system | Cubic | Cubic |
| Birefringence | None (isotropic) | None (isotropic) |
Values are typical ranges from standard gemmological references; individual stones can vary.