gemstone

Nephrite Jade Ring

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Hardness: 6.0-6.5 on the Mohs scale; Color: Dark green to black; Luster: Vitreous to greasy; Crystal Structure: Monoclinic (microcrystalline amphibole fibers in a dense interlocking mat); Cleavage: None (extremely tough and difficult to break); Specific Gravity: 2.95-3.10

Hardness: 6
Color: Dark green to black
Luster: Vitreous to greasy

Identified August 7, 2026More gemstone →

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Physical properties

Formation & geological history

Formed through metasomatism, a metamorphic process occurring at convergent plate boundaries where hydrothermal fluids alter ultrabasic rocks like peridotite or serpentinite interacting with adjacent carbonate rocks.

Uses & applications

Carved into jewelry, rings, pendants, and decorative ornaments due to its exceptional toughness and rich polish.

Geological facts

Nephrite jade is famously tougher than steel due to its tightly interwoven fibrous microstructure, making it historically favored for weapons, tools, and intricate carvings.

Field identification & locations

Identified by its high density, waxy or greasy luster, dark green to black coloration under varied lighting, and extreme resistance to impact fracture. Commonly sourced from British Columbia, China, New Zealand, and Wyoming.

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