Peach Moonstone

Peach Moonstone is a warm-toned variety of moonstone, a gem feldspar (typically orthoclase) prized for adularescence, the soft, billowy glow that seems to float beneath the surface. In peach moonstone the body color ranges from pale apricot to soft peach or light orange, with the characteristic milky-white to faintly bluish sheen.

The color comes from trace iron, while the shimmering sheen results from light scattering off microscopic layers within the feldspar. Peach moonstone often shows a gentle, glowing sheen rather than the strong blue flash of fine white moonstone.

It is widely used in jewelry, cut as cabochons and beads, and is valued for its soft, romantic appearance. India and Sri Lanka are major sources.

Peach Moonstone is a feldspar that forms in igneous rocks such as granites and pegmatites, and in some metamorphic rocks, as the magma or fluids cool. Moonstone's adularescence arises from a phenomenon called exsolution: as the feldspar cooled slowly, it separated into alternating microscopic layers of two feldspar phases (typically orthoclase and albite).

These ultra-thin layers scatter incoming light, producing the floating sheen (a form of the Schiller effect). Trace iron content gives the peach-to-orange body color. Major sources of gem moonstone, including peach material, are India, Sri Lanka, and Madagascar, with additional occurrences in Myanmar and Tanzania.

Look for a translucent feldspar with a warm peach-to-apricot body color and a soft, billowy sheen (adularescence) that moves across the stone as it is tilted, with a hardness of 6-6.5.

Moonstone feldspar has two directions of cleavage, a vitreous to pearly luster, and a white streak. The internal floating glow, rather than a surface or pinpoint sparkle, is the key tell.

Look-alikes: opal shows play-of-color (flashes of spectral colors) rather than a single billowy sheen; chalcedony and rose quartz lack adularescence and cleavage; sunstone shows metallic glittery inclusions (aventurescence) instead of a soft sheen. Milky body with a glowing, mobile sheen confirms peach moonstone.

Peach Moonstone is used chiefly in jewelry, cut as cabochons, beads, and freeforms for rings, pendants, earrings, and bracelets. Its warm color and gentle glow make it popular for romantic, vintage, and bohemian styles, and moonstone is a traditional June birthstone.

Because it is moderately soft (6-6.5) and has cleavage, it is better suited to pendants and earrings than to heavily worn rings, where it needs protective settings. Value depends on the strength and evenness of the sheen and the appeal of the body color.

In the metaphysical market it is marketed as a nurturing, intuition- and emotion-related "goddess" stone, though these claims are not scientific.