Moonstone is the best-known gem of the feldspar group of minerals. It is renowned for its adularescence, the light that appears to billow across a gemstone, giving it a special glow. The finest moonstones show a blue sheen against a colorless background. This June birthstone has been associated with both the Roman and Greek lunar deities. Hindu mythology claims that it is made of solidified moonbeams. Moonstone is often associated with love, passion and fertility; it is believed to bring great luck.
Great designers of the Art Nouveau era (1890s–1910s), such as René Lalique and Louis Comfort Tiffany, featured moonstone in their fine jewelry. The moonstone birthstone came to the forefront again during the 1960s “flower child” movement and with New Age designers of the 1990s.