gemstone

Dark blue oval gemstone ring, likely sapphire

Likely corundum (Al₂O₃); the image alone cannot confirm the stone or whether it is natural

AI-generated identification · may be incorrect

The oval, faceted-looking stone is very dark blue to nearly black with a vitreous luster, set in yellow-colored metal. If sapphire, hardness is 9 Mohs and its crystal system is trigonal; cut and setting obscure other diagnostic properties.

Identified October 10, 2026More gemstone →

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At a glance

Common name: Dark blue oval gemstone ring, likely sapphire
Scientific name: Likely corundum (Al₂O₃); the image alone cannot confirm the stone or whether it is natural
Category: gemstone
Identified: October 10, 2026
Method: Standard

AI Estimated Value

Approximately $20–$500 for a ring with an unidentified or synthetic dark stone; natural sapphire jewelry can be worth substantially more depending on stone quality and metal.

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

Sapphire forms in aluminum-rich, silica-poor geological environments, including metamorphic rocks and some igneous deposits; natural stones may be millions to billions of years old. A photograph cannot establish whether this is sapphire, another gem, or a synthetic stone.

Uses & applications

Jewelry; sapphire is also used in specialty optical and industrial components because of its hardness.

Geological facts

Dark sapphires can appear nearly black, especially under dim lighting. Gem identification requires examination or testing beyond the image.

Field identification & locations

Look for natural inclusions and characteristic color under strong light, but confirm identity with a gemologist; common sources include Sri Lanka, Madagascar, Myanmar, and Australia.