Spinel vs Pearl
Spinel is harder (Mohs 8) than Pearl (Mohs 2.5–4.5), so it resists scratching better; Pearl is softer than quartz dust (7) and needs more care in everyday rings.
Spinel has the higher refractive index (1.718 vs 1.53–1.69), which a refractometer can use to separate them.
Spinel is denser (SG 3.6 vs 2.71); a spinel of the same size weighs about 33% more.
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| Property | Spinel | Pearl |
|---|---|---|
| Species / material | Spinel | Organic (nacre) |
| Mohs hardness | 8 | 2.5–4.5 |
| Refractive index | 1.718 | 1.53–1.69 |
| Specific gravity | 3.6 | 2.71 |
| Crystal system | Cubic | Organic |
| Birefringence | None (isotropic) | Not applicable |
Values are typical ranges from standard gemmological references; individual stones can vary.