Gemstones with SG 2.70
14 gemstones have a specific gravity range that includes 2.70. 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 |
|---|---|---|---|---|
| Rainbow Moonstone | 2.68 – 2.72 | 1.559 – 1.572 | Triclinic | 6–6.5 |
| Heliodor | 2.68 – 2.74 | 1.568 – 1.580 | Hexagonal | 7.5–8 |
| Labradorite | 2.68 – 2.75 | 1.559 – 1.573 | Triclinic | 6–6.5 |
| Red Beryl | 2.66 – 2.70 | 1.564 – 1.574 | Hexagonal | 7.5–8 |
| Emerald | 2.67 – 2.78 | 1.565 – 1.602 | Hexagonal | 7.5–8 |
| Pearl | 2.60 – 2.85 | 1.520 – 1.690 | Aggregate | 2.5–4.5 |
| Hawk's Eye | 2.64 – 2.71 | 1.544 – 1.553 | Trigonal | 7 |
| Tiger's Eye | 2.64 – 2.71 | 1.544 – 1.553 | Trigonal | 7 |
| Aquamarine | 2.68 – 2.78 | 1.577 – 1.583 | Hexagonal | 7.5–8 |
| Goshenite | 2.68 – 2.80 | 1.577 – 1.583 | Hexagonal | 7.5–8 |
| Coral | 2.60 – 2.70 | 1.486 – 1.658 | Aggregate | 3–4 |
| Turquoise | 2.60 – 2.90 | 1.610 – 1.650 | Triclinic | 5–6 |
| Scapolite | 2.50 – 2.74 | 1.540 – 1.572 | Tetragonal | 6–6.5 |
| Lapis Lazuli | 2.70 – 2.90 | 1.500 – 1.670 | Aggregate | 5–6 |