Moonstone in Depth
Two feldspars in one stone
Moonstone is also a feldspar, and its glow comes from a similar trick to labradorite with a different result. As the melt cooled, orthoclase and albite separated into extremely thin alternating layers. Light scattering off those layers produces adularescence, a soft blue or white sheen that appears to float just under the surface and moves as you tilt the stone.
The finest material, nearly colorless with a strong blue shimmer, has historically come from Sri Lanka and southern India. Indian moonstone in peach, gray, and green is more common and more affordable, and rainbow moonstone, the popular white stone with blue flash, is technically a labradorite rather than orthoclase. It is still sold as moonstone everywhere and there is no point fighting the name.
Fragility people underestimate
At 6 to 6.5 on Mohs with perfect cleavage in two directions, moonstone is one of the more fragile stones commonly set into rings. It chips at the girdle, and a sharp knock on a cabochon can split it along a cleavage plane rather than just scratching it. Jewelers see cracked moonstone rings constantly.
Never put it in an ultrasonic or steam cleaner. Sudden temperature changes are also a risk. Wash with lukewarm water and a soft cloth, dry it fully, and store it padded and away from quartz, topaz, and anything harder. If you wear one daily, a bezel setting protects the edges far better than prongs.
How it gets used
The lunar association is ancient and cross-cultural, and modern practice follows the moon's cycle closely. A common approach is to set the stone out at the new moon while naming something you are starting, then check in with it at the full moon. Travelers historically carried moonstone as a protective token, and it still gets given for departures and new chapters.
It is worn rather than gridded most of the time, usually as a pendant near the throat or a ring on the receiving hand. If you want it in a layout, place it at the brow or over the belly and keep the arrangement simple, since moonstone's effect is described as gradual rather than sharp.
Pairings
Cancer is the primary sign association, with Libra and Scorpio also cited, and it is the traditional June birthstone alongside pearl and alexandrite. Chakra work places it at the sacral and the third eye, an unusual split that reflects its double reputation for cycles and for intuition.
Moonstone and labradorite together make a natural feldspar pair covering the visible and the hidden. Rose quartz softens it for emotional work, and clear quartz is the usual choice if you want the shimmer amplified without adding another personality to the arrangement. Avoid pairing it with heavy grounding stones if what you actually want is the dreamy quality, since practitioners find hematite in particular cancels the mood.