Gemstones with SG 3.05
7 gemstones have a specific gravity range that includes 3.05. 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 |
|---|---|---|---|---|
| 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 |
| Indicolite | 3.02 – 3.10 | 1.624 – 1.644 | Trigonal | 7–7.5 |
| Paraiba Tourmaline | 3.02 – 3.10 | 1.624 – 1.644 | Trigonal | 7–7.5 |
| Rubellite | 3.02 – 3.10 | 1.624 – 1.644 | Trigonal | 7–7.5 |
| Chrome Tourmaline | 3.00 – 3.20 | 1.624 – 1.660 | Trigonal | 7–7.5 |
| Tourmaline | 3.01 – 3.26 | 1.624 – 1.644 | Trigonal | 7–7.5 |