Pronunciation

speh-SIF-ik GRAV-i-tee

The ratio of a substance’s density to the density of water at 4°C. For gemstones, specific gravity is a primary identification tool measured by hydrostatic weighing or heavy-liquid suspension. Diaspore has a specific gravity of 3.30–3.39 — heavier than quartz (2.65), comparable to topaz, lighter than chrysoberyl (3.71).