Rock Identifier
Red coral earrings (Corallium rubrum or related precious coral (calcareous coral skeleton; primarily aragonite, CaCO₃)) — gemstone
gemstone

Red coral earrings

Corallium rubrum or related precious coral (calcareous coral skeleton; primarily aragonite, CaCO₃)

AI-generated identification · may be incorrect

Polished, opaque deep-red organic gemstone with a vitreous-to-waxy luster; Mohs hardness about 3–4, composed of dense fibrous aragonite rather than crystals. The surface shows characteristic fine growth structure and is set in decorative metal fittings.

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Physical properties

Polished, opaque deep-red organic gemstone with a vitreous-to-waxy luster; Mohs hardness about 3–4, composed of dense fibrous aragonite rather than crystals. The surface shows characteristic fine growth structure and is set in decorative metal fittings.

Formation & geological history

Precious coral forms as branching marine colonies in slowly growing deep-water environments, especially the Mediterranean and western Pacific; specimens may be centuries old. These earrings are shaped and polished human-processed coral, not a rock in the strict geological classification.

Uses & applications

Used for jewelry, ornament, and carving; coral beads have cultural and historical significance. High-quality natural coral is valued more than dyed, reconstituted, or imitation material.

Geological facts

Natural red coral can darken or develop a mottled patina with age. Many modern pieces are dyed bamboo coral, resin-filled coral, or plastic, and harvesting is regulated in many regions.

Field identification & locations

Look for natural variation, fine longitudinal grain, low hardness, and warm coloration; plastic feels lighter and may show bubbles, while glass is harder. A gemological test is needed to distinguish Corallium from dyed substitutes.