Moonstone makes me swoon!! These are the perfect everyday studs. Moonstone is a very powerful stone, and can pack a punch in even tiny pieces. The setting is sterling silver and the studs are about 6.5 mm. Moonstone changes color, and that's know as 'flash'. The stone itself is generally opaque to clear and contains flash of purples and blues depending on the light. Each of these studs has some blue flash. For more information on the healing properties of moonstone, please see the healing properties page.