Sardonyx is actually a variety of Chalcedony, and is a stone of protection and strength. It promotes virtuous conduct and integrity, attracts friends and good fortune, and brings lasting happiness and stability to partnerships. It increases stamina, vigor, self-control, alleviates depression, and overcomes hesitancy. It has been used to heal lungs and bones, regulate fluids and cell metabolism, and to strengthen the immune system. Black Sardonyx also absorbs negativity. Strung on stretch cord for wear ability. Dzi guru bead. 27 count. Two styles available.