Gemstones with SG 3.55
5 gemstones have a specific gravity range that includes 3.55. 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 |
|---|---|---|---|---|
| Rhodochrosite | 3.40 – 3.70 | 1.600 – 1.820 | Trigonal | 3.5–4 |
| Topaz | 3.49 – 3.57 | 1.609 – 1.643 | Orthorhombic | 8 |
| Synthetic Spinel | 3.52 – 3.65 | 1.725 – 1.728 | Cubic | 8 |
| Sphene | 3.45 – 3.55 | 1.843 – 2.110 | Monoclinic | 5–5.5 |
| Kyanite | 3.53 – 3.68 | 1.712 – 1.734 | Triclinic | 4.5–7 |