gemstone

Blue aventurine (likely)

Quartz-rich aventurine, chiefly SiO₂; blue color may come from fine dumortierite or other inclusions

AI-generated identification · may be incorrect

Polished cabochon, deep blue with subtle mottling and vitreous luster; quartz hardness about 7 Mohs, trigonal crystal structure, no cleavage, specific gravity about 2.6. The photo alone cannot confirm the exact stone or treatment.

Identified October 15, 2026More gemstone →

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Physical properties

Formation & geological history

Quartz-rich rock formed through metamorphism or silica-rich fluids; accessory inclusions create its color. Its geological age depends on the source deposit.

Uses & applications

Used for cabochon jewelry, beads, and decorative carvings.

Geological facts

Aventurine’s shimmering varieties often contain reflective mineral inclusions; blue material is less common than green aventurine.

Field identification & locations

Check for natural-looking mottling, glassy polish, and hardness, but these are not definitive; gemological testing can distinguish it from dyed quartz, glass, or other blue stones. Quartz-rich aventurine occurs in several metamorphic and hydrothermal deposits worldwide.