gemstone

Moonstone ring

Moonstone, a feldspar variety (typically orthoclase or adularia; KAlSi₃O₈)

AI-generated identification · may be incorrect

The cabochon shows blue-white adularescence, with a translucent body and vitreous luster. Moonstone is monoclinic, Mohs hardness 6–6.5, and has two good cleavage directions; the surrounding metal appears to be a silver-colored setting.

Identified September 25, 2026More gemstone →

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Physical properties

Formation & geological history

Moonstone forms in feldspar-rich igneous and metamorphic rocks as feldspar crystals develop fine internal layering that scatters light. Such deposits occur in geologically diverse regions, including Sri Lanka, India, Madagascar, and Myanmar.

Uses & applications

Used mainly in jewelry, especially cabochon rings, pendants, and earrings; this specimen is set in a ring.

Geological facts

Its floating glow, called adularescence, shifts with viewing angle and results from light scattering between microscopic feldspar layers.

Field identification & locations

Identify genuine moonstone by its soft, moving sheen rather than glitter or fixed color; the photo alone cannot confirm the stone’s identity or natural versus synthetic origin. Common sources include Sri Lanka and India.