metamorphic

Likely lapis lazuli

Lapis lazuli; predominantly lazurite, with calcite and pyrite

AI-generated identification · may be incorrect

The blue, opaque cabochon is consistent with lapis lazuli: Mohs hardness about 5–5.5, vitreous to dull luster, granular texture, and no visible cleavage. White calcite veining and metallic-gold pyrite flecks may occur, though the image is not detailed enough to confirm them.

Identified September 7, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed by contact metamorphism of limestone, commonly during Mesozoic or older mountain-building events; prized material comes from Afghanistan, with deposits also in Chile, Russia, and Pakistan.

Uses & applications

Used for cabochon jewelry, carvings, ornaments, and historically ultramarine pigment. The ring setting is silver-colored metal, likely sterling silver, but the stone identity cannot be proven from the photograph alone.

Geological facts

A rich, relatively uniform blue with sparse pyrite generally commands more value than pale or heavily calcitic material; dyed blue calcite or sodalite can look similar.

Field identification & locations

Field identification requires checking for a granular blue body, calcite streaks, and pyrite; lapis lazuli is opaque and does not show the glassy transparency of sapphire. Confirmation requires hardness, streak, magnification, or gemological testing.