gemstone
Tahitian Pearl (Black / Pistachio Pearl)
Biogenic Aragonite / Calcite (CaCO3 with conchiolin)
AI-generated identification · may be incorrectHardness 2.5–4.5 on Mohs scale; pearly, iridescent luster; specific gravity 2.60–2.85; spherical to near-round shape with an olive-green/pistachio overtone.
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Physical properties
Hardness 2.5–4.5 on Mohs scale; pearly, iridescent luster; specific gravity 2.60–2.85; spherical to near-round shape with an olive-green/pistachio overtone.
Formation & geological history
Biogenic gemstone secreted by the black-lipped oyster (Pinctada margaritifera) in warm marine lagoons, primarily formed through modern mariculture.
Uses & applications
Predominantly mounted into fine jewelry such as earrings, rings, and pendants; also collected as organic gemstones.
Geological facts
Naturally colored pearls from French Polynesia owe their dark and exotic pistachio shades to trace organic pigments and microscopic nacre layering.
Field identification & locations
Identified by its distinctive orient, metallic/satiny sheen, slight cool feel to the touch, and subtle micro-textured surface under magnification.
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