What is adularescence?
By Jared James · Last updated 21 May 2026
Definition
Adularescence is the soft, billowy glow that seems to drift just under the surface of certain gemstones, most famously moonstone. Instead of sitting on the stone, the light appears to float inside it and roll across as you tilt the piece, a little like moonlight caught in water. It happens because the stone's internal layered structure scatters light back to your eye. Moonstone shows it best, though you can sometimes catch a softer version of it in rose quartz and agate.
Frequently asked questions
- What gemstones show adularescence?
- Moonstone is the classic example and shows it most clearly. The effect can also appear, usually more faintly, in rose quartz and some agates, and in any stone with the right internal layering.
- What causes adularescence in moonstone?
- It comes from the stone's structure. Moonstone is made of thin alternating layers, and when light hits them it scatters and bounces back as that soft floating glow rather than passing straight through.
- Is adularescence the same as opalescence?
- They are often confused but they are different. Adularescence is the floating blue-white glow of moonstone, while opalescence is the play of rainbow colours seen in opal. Both are optical effects, just produced in different ways.
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