gemstone

Black Opal Ring (Carved Opal)

Hydrated Silicon Dioxide (SiO2·nH2O)

Hardness: 5.5-6.5 on Mohs scale. Color: Dark/black body tone with vibrant play-of-color (blue, purple, green, orange, red). Luster: Vitreous to resinous. Structure: Amorphous (non-crystalline mineraloid).

Hardness: 5
Luster: Vitreous to resinous

Identified July 26, 2026More gemstone →

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Physical properties

Formation & geological history

Formed at relatively low temperatures from silica-rich waters circulating through cavities in sedimentary rocks, particularly in arid regions during Cretaceous and Paleogene periods.

Uses & applications

Fine jewelry, luxury carved gemstone pieces, high-end gemstone collections, and ornamental artwork.

Geological facts

Black opal is the rarest and most valuable form of opal, highly prized for its dark body tone that enhances the intensity of its internal rainbow-like play-of-color. Australia produces over 90% of the world's precious opal.

Field identification & locations

Identified by its dark body tone (N1 to N4 rating) coupled with brilliant iridescent play-of-color. Highly valued by collectors for custom carvings and unique jewelry pieces. Main origin is Lightning Ridge, Australia.

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