gemstone

Polished heart-shaped blue chalcedony or agate

Cryptocrystalline quartz (SiO₂), likely blue chalcedony; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; pale translucent blue-gray color, waxy to vitreous luster, and no visible cleavage. Typically microcrystalline quartz with conchoidal fracture; the heart shape is human-cut and polished.

Identified September 19, 2026More gemstone →

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At a glance

Common name: Polished heart-shaped blue chalcedony or agate
Scientific name: Cryptocrystalline quartz (SiO₂), likely blue chalcedony; exact identification is uncertain from the image
Category: gemstone
Identified: September 19, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a small common polished piece; $20–$75 if it is verified, naturally colored blue lace agate or fine chalcedony.

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

Chalcedony forms when silica-rich groundwater fills cavities and fractures, commonly in volcanic rocks; deposits range from Paleozoic to recent. Blue coloration may be natural, enhanced, or caused by inclusions.

Uses & applications

Used for cabochons, carvings, tumbled stones, jewelry, and ornaments; this small polished heart has mainly decorative or sentimental value.

Geological facts

The specimen may also be blue lace agate, dyed quartz, or glass; a photograph cannot reliably distinguish these. Genuine quartz should resist scratching by a steel blade, though testing can damage the polish.

Field identification & locations

Common sources include Brazil, Uruguay, Namibia, Turkey, and the western United States. Check for internal banding, bubbles, uniform dye concentration, and glass-like chips; professional testing can confirm composition.