| Property | Alexandrite | Diamond |
|---|---|---|
| Category | Semi-Precious Gems | Precious Gems |
| Primary Color | various | various |
| Mohs Hardness | 8.5 | 10.0 |
| Specific Gravity | 3.69 | 3.5 |
| Refractive Index | 1.739 | 2.417 |
| Crystal System | Orthorhombic | Isometric |
| Luster | — | Adamantine,Greasy |
| Chemical Formula | — | — |
| Price Tier | Fine ($500-5,000/ct) | Investment ($5,000+/ct) |
| Daily Wear | Oui | Oui |