Black Moonstone supports the naval chakra. Black Moonstone helps with relationships. It increases stamina, helps with focus and concentration. Black Moonstone supports the kidneys, liver, colon, and spleen. It also helps with female reproductive organs and hormones. Metaphysical properties are provided for your information and are not meant to replace the advice of a qualified physician or medical practitioner. Due to the nature of this product, color, size, and shape will vary. Quarter is used for size reference.