Tanzanite vs Jadeite jade
Jadeite jade is harder (Mohs 6.5–7) than Tanzanite (Mohs 6–7), so it resists scratching better; Tanzanite is softer than quartz dust (7) and needs more care in everyday rings.
Tanzanite has the higher refractive index (1.691–1.700 vs 1.66), which a refractometer can use to separate them.
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| Property | Tanzanite | Jadeite jade |
|---|---|---|
| Species / material | Zoisite | Jadeite (pyroxene) |
| Mohs hardness | 6–7 | 6.5–7 |
| Refractive index | 1.691–1.700 | 1.66 |
| Specific gravity | 3.35 | 3.34 |
| Crystal system | Orthorhombic | Monoclinic (aggregate) |
| Birefringence | 0.008–0.013 | Not usually measurable |
Values are typical ranges from standard gemmological references; individual stones can vary.
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