DEVATI ~ Adjustable Moonstone Ring - Natural Moonstone Material: Rhodium-plated silver plated brass Ring size: adjustable Stone size: 6x9 mm What is moonstone The moonstone or adularia is a lava stone and its crystalline system is monoclinic. It belongs to the feldspar family such as obsidian, it is a potassium and aluminum silicate. Semi-transparent and translucent, it has a variable color: blue with clear reflections, from white to pearly gray with a soft, silvery sheen that recalls moonlight and this particular optical effect is called adularescence. Moonstone: origin and meaning As its name indicates, moonstone is traditionally associated with the moon and the feminine energies of the Great Mother, the feminine spirit of the Universe.