gemstone

Red coral bead necklace

Precious coral, typically Corallium spp.; calcium carbonate (aragonite/calcite)

AI-generated identification · may be incorrect

Opaque to waxy red-orange beads with polished luster; coral has Mohs hardness about 3–4 and is not crystalline like a mineral. The image alone cannot confirm whether these are natural coral or imitation beads.

Identified October 4, 2026More gemstone →

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Physical properties

Formation & geological history

Natural coral forms as the calcium-carbonate skeletons of marine colonies, growing slowly in deep-water environments over many years. The beads are shaped and polished from harvested material.

Uses & applications

Used chiefly in jewelry and collected as ornamental beads; coral is fragile and sensitive to acids, heat, and chemicals.

Geological facts

Precious coral has a long history in jewelry, but harvesting is restricted in many regions because coral populations are vulnerable.

Field identification & locations

Natural coral often shows fine growth lines and may have irregularities; uniform color and bead shape can also occur in treated coral or imitations. Common sources include the Mediterranean and western Pacific.