gemstone

Pearl necklace (likely cultured pearls)

Pearl; chiefly aragonite (CaCO₃) in an organic conchiolin matrix

AI-generated identification · may be incorrect

Pearls are typically Mohs 2.5–4.5, with rounded forms, pearly luster, and layered nacre; they lack a conventional crystal structure as whole objects. The image shows cream-white beads with iridescence, but cannot establish whether they are natural, cultured, or imitation.

Identified October 5, 2026More gemstone →

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Physical properties

Formation & geological history

Pearls form inside mollusks when nacre layers accumulate around an irritant or inserted nucleus; cultured pearls are produced by human-assisted mollusk cultivation. Their age depends on the mollusk and harvest, generally months to several years.

Uses & applications

Used primarily in jewelry and ornament; pearls have little structural or industrial use.

Geological facts

Unlike most gemstones, pearls are formed by living mollusks and are valued for nacre quality, luster, shape, size, and color.

Field identification & locations

Look for layered nacre and subtle surface variation; magnification and professional testing help distinguish genuine pearls from glass or plastic imitations. Cultured pearls are commonly farmed in Japan, China, Australia, and the South Pacific.