| Property | Amethyst | Petrified Wood (Fossilized Wood) |
|---|---|---|
| Category | Semi-Precious Gems | Semi-Precious Gems |
| Primary Color | purple | various |
| Mohs Hardness | 7.0 | 6.5–7.0 |
| Specific Gravity | 2.65 | 2.58 |
| Refractive Index | 1.544 | — |
| Crystal System | Trigonal | Trigonal |
| Luster | — | — |
| Chemical Formula | — | — |
| Price Tier | Moderate ($50-500/ct) | Moderate ($50-500/ct) |
| Daily Wear | Ja | Nein |