Gemstones with SG 3.00
5 gemstones have a specific gravity range that includes 3.00. 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 |
|---|---|---|---|---|
| Danburite | 2.97 – 3.02 | 1.627 – 1.636 | Orthorhombic | 7–7.5 |
| Nephrite | 2.90 – 3.03 | 1.600 – 1.627 | Aggregate | 6–6.5 |
| Green Tourmaline | 3.00 – 3.10 | 1.616 – 1.650 | Trigonal | 7–7.5 |
| Watermelon Tourmaline | 3.00 – 3.10 | 1.616 – 1.650 | Trigonal | 7–7.5 |
| Chrome Tourmaline | 3.00 – 3.20 | 1.624 – 1.660 | Trigonal | 7–7.5 |