Black Moonstone is a gemstone that has been believed for its power to make people's mind calm. It can restrain unnecessary negative energy. From ancient times, Moonstone has been valued as a great healing gemstone. ... Black Moonstone has a good balance of strength and kindness.
That being said, the black moonstone is very rare due to how it comes into being and where you can find them. The black moonstone is the rarest of all moonstones such as the rainbow moonstone and the white moonstone.