Moonstone, the third birthstone for June, was given its name by the Roman natural historian Pliny, who wrote that moonstone's appearance altered with the phases of the moon — a belief that held until well after the sixteenth century. 

A phenomenal gemstone, moonstones show a floating play of light (called adularescence) and sometimes show either a multi-rayed star or a cat's eye. Moonstone is a feldspar mineral and has a hardness of 6-6.5. Moonstone commonly occurs in glowing peach, gray and white tones, but also occurs in what is called "rainbow moonstone". Moonstones have been used throughout history; Romans used this stone for adornment almost 2000 years ago and in India it's always been considered a sacred stone. Moonstone is believed to be a stone of destiny. It is strongly connected to the moon and the divine feminine, making it a wonderfully helpful stone for women enhancing feminine energy, and offering protection through pregnancy, childbirth, and beyond. It is worn to increase fertility and harmonize the mind, providing health and protection. Moonstone helps to align the hormone production, metabolism and reproduction. It allows deep-rooted feelings to energize and come to the forefront. Moonstone is believed to evoke patience and can aid in releasing frustration. It was believed that someone who placed a moonstone in their mouth during the full moon would be able to see their future.

Considered a sacred stone in India, moonstones often are displayed on a background of yellow (a sacred color) and are believed to encapsulate within the stone a spirit whose purpose is to bring good fortune.  Moonstone is found in Sri Lanka, Madagascar, Myanmar, Australia, India and the United States