Diamond vs Alexandrite
Diamond is harder (Mohs 10) than Alexandrite (Mohs 8.5), so it resists scratching better.
Diamond has the higher refractive index (2.417 vs 1.746–1.755), which a refractometer (over-the-limit reading) can use to separate them.
Alexandrite is denser (SG 3.73 vs 3.52); a alexandrite of the same size weighs about 6% more.
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| Property | Diamond | Alexandrite |
|---|---|---|
| Species / material | Diamond (carbon) | Chrysoberyl |
| Mohs hardness | 10 | 8.5 |
| Refractive index | 2.417 | 1.746–1.755 |
| Specific gravity | 3.52 | 3.73 |
| Crystal system | Cubic | Orthorhombic |
| Birefringence | None (isotropic) | 0.008–0.010 |
Values are typical ranges from standard gemmological references; individual stones can vary.
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