Coral
JewelryWiki Editorial·1 source·Reviewed 2026-07-31
An organic gem. Like pearl, damaged by heat, light and household chemicals rather than by scratching.
Properties
| Property | Value | Authority |
|---|---|---|
| Refractive index | 1.486–1.658 [1] | — |
| Specific gravity | 2.60–2.70 [1] | — |
Sources
- International Gem Society — reference charts (Mohs hardness, specific gravity, refractive index) — International Gem Society (IGS reference charts)