Generally a white or semi-translucent stone, rainbow moonstone features occasional iridescent or multi-colour flashes with transparency that ranges from opaque to semi-translucent. Rainbow moonstone is best seen in natural light for play of colour. Sizes, shapes and colours may vary.
The Romans thought moonstone was formed out of moonlight and began wearing it in jewellery around 100 A.D. The gemstone has always been considered sacred in India, and Europeans of the Middle Ages thought by looking into a moonstone, you would fall into a deep sleep and see the future. Moonstone was very popular early in the 20th century and was used extensively in art nouveau jewelry. Legend suggests that moonstone is supposed to awaken tender passions if placed beneath the tongues of lovers during a full moon. In addition, it has been recommended that holding a moonstone in the mouth will refresh one's memory. The gemstone is believed to be protective for women and babies and to soothe and balance the emotions. Many believe it to align vertebrae and act as a digestive aid.