Gemstones with SG 3.70
10 gemstones have a specific gravity range that includes 3.70. 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 |
|---|---|---|---|---|
| Color-Change Garnet | 3.65 – 3.80 | 1.740 – 1.765 | Cubic | 7–7.5 |
| Rhodonite | 3.57 – 3.76 | 1.716 – 1.752 | Triclinic | 5.5–6.5 |
| Alexandrite | 3.70 – 3.78 | 1.746 – 1.755 | Orthorhombic | 8.5 |
| Cat's Eye Chrysoberyl | 3.70 – 3.78 | 1.746 – 1.755 | Orthorhombic | 8.5 |
| Chrysoberyl | 3.70 – 3.78 | 1.746 – 1.755 | Orthorhombic | 8.5 |
| Pyrope Garnet | 3.62 – 3.87 | 1.730 – 1.760 | Cubic | 7–7.5 |
| Grossular Garnet | 3.57 – 3.73 | 1.734 – 1.759 | Cubic | 6.5–7.5 |
| Malaya / Umbalite Garnet | 3.65 – 3.87 | 1.730 – 1.780 | Cubic | 7–7.5 |
| Malachite | 3.60 – 4.05 | 1.655 – 1.909 | Monoclinic | 3.5–4 |
| Rhodochrosite | 3.40 – 3.70 | 1.600 – 1.820 | Trigonal | 3.5–4 |