Gemstones with SG 2.55

7 gemstones have a specific gravity range that includes 2.55. Specific gravity measures density relative to water — a key diagnostic property for gem identification. Measured by hydrostatic weighing or heavy liquids.

← All SG Values

GemstoneSG RangeRI RangeCrystal SystemHardness
Amazonite2.54 – 2.581.514 – 1.530Triclinic6–6.5
Serpentine2.44 – 2.621.560 – 1.571Monoclinic3–4
Howlite2.45 – 2.581.583 – 1.608Monoclinic3.5
Variscite2.40 – 2.601.560 – 1.590Orthorhombic3.5–4.5
Charoite2.54 – 2.681.550 – 1.559Monoclinic5–6
Scapolite2.50 – 2.741.540 – 1.572Tetragonal6–6.5
Obsidian2.30 – 2.601.480 – 1.510Amorphous5–5.5
Try GemID Free →