gemstone

Blue gemstone ring (likely sapphire)

Likely corundum, Al₂O₃; the dark, reflective appearance may also indicate a treated or synthetic stone.

AI-generated identification · may be incorrect

The image shows a dark blue, polished cabochon in a silver-colored setting; hardness and crystal structure cannot be confirmed visually. Sapphire has Mohs hardness 9 and a trigonal crystal structure.

Identified September 26, 2026More gemstone →

Explore Blue gemstone ring (likely sapphire) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Blue gemstone ring (likely sapphire)
Scientific name: Likely corundum, Al₂O₃; the dark, reflective appearance may also indicate a treated or synthetic stone.
Category: gemstone
Identified: September 26, 2026
Method: Standard

AI Estimated Value

Approximately $20–$300 for a fashion ring with an unverified stone; substantially more if the sapphire and metal are authenticated.

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

The image shows a dark blue, polished cabochon in a silver-colored setting; hardness and crystal structure cannot be confirmed visually. Sapphire has Mohs hardness 9 and a trigonal crystal structure.

Formation & geological history

Natural sapphire forms in aluminum-rich rocks during metamorphism or in certain igneous environments; its age depends on the deposit. The mounted stone’s natural or synthetic origin cannot be determined from the image.

Uses & applications

Jewelry; sapphire is also used in durable watch crystals and specialized optical or industrial components.

Geological facts

Sapphire is the blue variety of corundum, with color caused commonly by trace iron and titanium. Similar-looking dark stones and synthetic sapphires are common in rings.

Field identification & locations

A gemological test is needed to identify the stone; inspect under magnification for inclusions and have a jeweler test refractive properties. Sapphire occurs in places including Sri Lanka, Madagascar, Myanmar, and Australia.