Gemstones with RI 1.570
13 gemstones have a refractive index range that includes 1.570. Refractive index measures how much light bends when entering a gem — it's one of the most diagnostic properties for identification. Measured with a gemological refractometer.
| Gemstone | RI Range | SG Range | Crystal System | Optic Character |
|---|---|---|---|---|
| Red Beryl | 1.564 – 1.574 | 2.66 – 2.70 | Hexagonal | DR_U- |
| Coral | 1.486 – 1.658 | 2.60 – 2.70 | Aggregate | AGG |
| Heliodor | 1.568 – 1.580 | 2.68 – 2.74 | Hexagonal | DR_U- |
| Labradorite | 1.559 – 1.573 | 2.68 – 2.75 | Triclinic | DR_B- |
| Rainbow Moonstone | 1.559 – 1.572 | 2.68 – 2.72 | Triclinic | DR_B- |
| Serpentine | 1.560 – 1.571 | 2.44 – 2.62 | Monoclinic | AGG |
| Variscite | 1.560 – 1.590 | 2.40 – 2.60 | Orthorhombic | DR_B- |
| Emerald | 1.565 – 1.602 | 2.67 – 2.78 | Hexagonal | DR_U- |
| Scapolite | 1.540 – 1.572 | 2.50 – 2.74 | Tetragonal | DR_U- |
| Lapis Lazuli | 1.500 – 1.670 | 2.70 – 2.90 | Aggregate | AGG |
| Sunstone | 1.537 – 1.572 | 2.62 – 2.65 | Triclinic | DR_B- |
| Chrysocolla | 1.460 – 1.630 | 2.00 – 2.40 | Amorphous | AGG |
| Pearl | 1.520 – 1.690 | 2.60 – 2.85 | Aggregate | AGG |