gemstone

Blue gemstone cross pendant

Likely faceted blue topaz (Al₂SiO₄(F,OH)₂); identification is uncertain from the image

AI-generated identification · may be incorrect

Small transparent-to-translucent, light-blue faceted stones with vitreous luster, set in metal. If topaz, hardness is 8 on the Mohs scale and its crystals are orthorhombic; the stones’ identity cannot be confirmed visually alone.

Identified October 3, 2026More gemstone →

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Physical properties

Formation & geological history

Topaz forms in silica-rich granitic pegmatites and high-temperature cavities; its age depends on the deposit. The pendant is a human-made jewelry setting assembled from cut stones.

Uses & applications

Jewelry and collecting; blue topaz is commonly used in rings, earrings, and pendants.

Geological facts

Blue topaz is often produced by irradiating and heating colorless topaz; natural blue material is comparatively uncommon.

Field identification & locations

Check gemological properties or have a jeweler test the stones to distinguish topaz from other blue gems or glass. Topaz occurs in Brazil, Pakistan, Russia, and elsewhere.