Tahitian Black Pearl

Physical Properties

Hardness: 2.5–4.5; Color: Black, charcoal, or dark green with peacock/iridescent overtones; Luster: Pearly to metallic; Structure: Orthorhombic (microcrystalline); Cleavage: None; Specific Gravity: 2.60–2.85

Formation & Geological History

Formed within the Pinctada margaritifera (black-lipped oyster) by secreting nacre over an irritant or nucleus. Most modern specimens are from aquaculture in French Polynesia.

Uses & Applications

Primarily used in high-end fine jewelry, such as rings, necklaces, and earrings; also highly sought after by gemstone collectors.

Geological Facts

Tahitian pearls are one of the most exotic pearls in the world; unlike white pearls, their dark color is natural and not the result of dyeing. They are often called 'Black Pearls' but exhibit a kaleidoscope of colors.

Field Identification & Locations

Identify by 'tooth test' (gritty surface feel), weight, and unique peacock iridescent overtones. Found in the lagoons of the Tuamotu Archipelago and Gambier Islands.

Identified on: 4/20/2026

Mode: Standard