gemstone

Pink Coral

Corallium rubrum (or related species, composed of calcium carbonate)

Hardness: 3.5 on the Mohs scale, Color: Light pink to salmon, Luster: Vitreous to dull when polished, Crystal structure: Orthorhombic (aragonite structure), Cleavage: Distinct in one direction, Specific gravity: 2.60 to 2.70

Hardness: 3

Identified August 2, 2026More gemstone →

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Physical properties

Formation & geological history

Formed organically from the skeletal remains of marine coral polyps, primarily in deep-sea environments with strong currents, dating from modern back through geological epochs.

Uses & applications

Widely used in high-end jewelry, carvings, beads, and ornamental objects.

Geological facts

Precious coral has been harvested and traded for thousands of years, highly valued in ancient civilizations for ornamentation and as an amulet of protection.

Field identification & locations

Identified by its organic origin, characteristic pink to red color, and reactivity to dilute hydrochloric acid due to calcium carbonate composition. Found in the Mediterranean Sea and parts of the Pacific Ocean.

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