gemstone

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

AI-generated identification · may be incorrect

Translucent vivid red, vitreous luster, smoothly polished domed cabochon. Synthetic ruby has Mohs hardness 9 and specific gravity about 4.0; glass is softer (about 5–6) and commonly shows bubbles or flow lines.

Identified August 17, 2026More gemstone →

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At a glance

Common name: Red glassy cabochon, likely synthetic ruby or red glass
Scientific name: Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass
Category: gemstone
Identified: August 17, 2026
Method: Standard

AI Estimated Value

About $1–$20 if glass or common synthetic material; approximately $10–$100+ for a larger, well-cut synthetic ruby cabochon.

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

If synthetic ruby, it was laboratory-grown by flame-fusion or another process; if glass, it was melted silica-based material. The image does not establish a natural geological origin or age.

Uses & applications

Used as an inexpensive jewelry cabochon, decorative stone, or craft piece; synthetic ruby can have gem value, while red glass is mainly ornamental.

Geological facts

Its perfectly rounded shape, intense uniform color, and very high transparency are more typical of manufactured material than natural ruby or garnet. A refractometer, loupe, and hardness testing are needed for identification.

Field identification & locations

Inspect for bubbles, swirled flow structure, or mold seams (glass); synthetic ruby may show curved growth bands and strong red fluorescence. Natural red stones to compare include ruby, spinel, and garnet.