Aquamarine vs Peridot
Aquamarine is harder (Mohs 7.5–8) than Peridot (Mohs 6.5–7), so it resists scratching better; Peridot is softer than quartz dust (7) and needs more care in everyday rings.
Peridot has the higher refractive index (1.654–1.690 vs 1.577–1.583), which a refractometer can use to separate them.
Peridot is denser (SG 3.34 vs 2.72); a peridot of the same size weighs about 23% more.
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| Property | Aquamarine | Peridot |
|---|---|---|
| Species / material | Beryl | Olivine (forsterite) |
| Mohs hardness | 7.5–8 | 6.5–7 |
| Refractive index | 1.577–1.583 | 1.654–1.690 |
| Specific gravity | 2.72 | 3.34 |
| Crystal system | Hexagonal | Orthorhombic |
| Birefringence | 0.005–0.009 | 0.035–0.038 |
Values are typical ranges from standard gemmological references; individual stones can vary.
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