Tanzanite vs Pearl
Tanzanite is harder (Mohs 6–7) 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.
Tanzanite has the higher refractive index (1.691–1.700 vs 1.53–1.69), which a refractometer can use to separate them.
Tanzanite is denser (SG 3.35 vs 2.71); a tanzanite of the same size weighs about 24% more.
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| Property | Tanzanite | Pearl |
|---|---|---|
| Species / material | Zoisite | Organic (nacre) |
| Mohs hardness | 6–7 | 2.5–4.5 |
| Refractive index | 1.691–1.700 | 1.53–1.69 |
| Specific gravity | 3.35 | 2.71 |
| Crystal system | Orthorhombic | Organic |
| Birefringence | 0.008–0.013 | Not applicable |
Values are typical ranges from standard gemmological references; individual stones can vary.
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