Tourmaline vs Pearl
Tourmaline is harder (Mohs 7–7.5) 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.
Tourmaline has the higher refractive index (1.624–1.644 vs 1.53–1.69), which a refractometer can use to separate them.
Tourmaline is denser (SG 3.06 vs 2.71); a tourmaline of the same size weighs about 13% more.
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| Property | Tourmaline | Pearl |
|---|---|---|
| Species / material | Tourmaline | Organic (nacre) |
| Mohs hardness | 7–7.5 | 2.5–4.5 |
| Refractive index | 1.624–1.644 | 1.53–1.69 |
| Specific gravity | 3.06 | 2.71 |
| Crystal system | Trigonal | Organic |
| Birefringence | 0.014–0.021 | Not applicable |
Values are typical ranges from standard gemmological references; individual stones can vary.
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