Gemstones with SG 2.80
7 gemstones have a specific gravity range that includes 2.80. 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 |
|---|---|---|---|---|
| Lapis Lazuli | 2.70 – 2.90 | 1.500 – 1.670 | Aggregate | 5–6 |
| Morganite | 2.71 – 2.85 | 1.572 – 1.600 | Hexagonal | 7.5–8 |
| Larimar | 2.74 – 2.90 | 1.595 – 1.640 | Triclinic | 4.5–5 |
| Sugilite | 2.74 – 2.80 | 1.607 – 1.610 | Hexagonal | 5.5–6.5 |
| Turquoise | 2.60 – 2.90 | 1.610 – 1.650 | Triclinic | 5–6 |
| Goshenite | 2.68 – 2.80 | 1.577 – 1.583 | Hexagonal | 7.5–8 |
| Pearl | 2.60 – 2.85 | 1.520 – 1.690 | Aggregate | 2.5–4.5 |