Gemstones with SG 4.15
3 gemstones have a specific gravity range that includes 4.15. Specific gravity measures density relative to water — a key diagnostic property for gem identification. Measured by hydrostatic weighing or heavy liquids.
| Gemstone | SG Range | RI Range | Crystal System | Hardness |
|---|---|---|---|---|
| Spessartite Garnet | 4.12 – 4.18 | 1.790 – 1.815 | Cubic | 7–7.5 |
| Almandine Garnet | 3.93 – 4.30 | 1.770 – 1.830 | Cubic | 7–7.5 |
| Star Garnet | 3.93 – 4.30 | 1.770 – 1.830 | Cubic | 7–7.5 |