Gemstones with SG 3.40
4 gemstones have a specific gravity range that includes 3.40. 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 |
|---|---|---|---|---|
| Peridot | 3.27 – 3.48 | 1.654 – 1.690 | Orthorhombic | 6.5–7 |
| Kornerupine | 3.27 – 3.45 | 1.660 – 1.699 | Orthorhombic | 6.5 |
| Jadeite | 3.24 – 3.43 | 1.654 – 1.688 | Aggregate | 6.5–7 |
| Rhodochrosite | 3.40 – 3.70 | 1.600 – 1.820 | Trigonal | 3.5–4 |