gemstone
Pearl (in Marcasite Jewelry)
Biogenic Calcium Carbonate (primarily Aragonite, CaCO3)
AI-generated identification · may be incorrectMohs hardness 2.5–4.5, pearly iridescent luster (orient), white to cream color, specific gravity 2.60–2.85.
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Physical properties
Mohs hardness 2.5–4.5, pearly iridescent luster (orient), white to cream color, specific gravity 2.60–2.85.
Formation & geological history
Formed biologically inside shelled mollusks via concentric layers of nacre (aragonite plates bound by conchiolin).
Uses & applications
Primarily set into fine and vintage jewelry including earrings, necklaces, and brooches.
Geological facts
Unlike geological gemstones formed in the Earth's crust, pearls are among the few organic gems produced by living organisms.
Field identification & locations
Identifiable by its soft pearly iridescence and slight grittiness when gently rubbed against tooth enamel, unlike smooth plastic imitations.
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