Side-by-side evidence
Ruby vs Blue Sapphire
Compare two to five profiles. Pending values remain visibly pending.
| Property | Ruby | Blue Sapphire |
|---|---|---|
| Mineral species | Corundum | Corundum |
| Formula | Al₂O₃ | Al₂O₃ |
| Mohs hardness | 9 | 9 |
| Refractive index | 1.762–1.77 | 1.762–1.77 |
| Specific gravity | 3.95–4.05 | 4 |