gemstone

Blue faceted gemstones, likely blue sapphire

Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium

AI-generated identification · may be incorrect

Hardness 9 Mohs; typically blue, vitreous luster, trigonal crystal structure, and no prominent cleavage. The pictured small faceted stones may also be blue spinel or synthetic sapphire; the image alone cannot confirm identity.

Identified August 8, 2026More gemstone →

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At a glance

Common name: Blue faceted gemstones, likely blue sapphire
Scientific name: Corundum (Al₂O₃), blue varieties colored chiefly by iron and titanium
Category: gemstone
Identified: August 8, 2026
Method: Standard

AI Estimated Value

Approximately $10–$100 per carat for commercial stones, $200–$10,000+ per carat for fine natural sapphire; synthetic or imitation stones may be $1–$20 each.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Natural sapphire forms in aluminum-rich metamorphic rocks or certain igneous deposits, commonly during regional metamorphism; geological ages vary widely. Synthetic stones are laboratory-grown and may be nearly identical visually.

Uses & applications

Used extensively in jewelry, watches, and precision components; industrial sapphire serves as scratch-resistant windows and bearings.

Geological facts

Sapphire is the non-red gem variety of corundum; ruby is also corundum but colored mainly by chromium. Strong pleochroism, inclusions, and laboratory testing help distinguish natural stones from synthetics and imitations.

Field identification & locations

Field identification requires hardness, refractive index, specific gravity, dichroscope, and microscopy; color alone is insufficient. Major sources include Sri Lanka, Myanmar, Kashmir, Madagascar, Australia, and Montana.