Natural Sardonyx Lithotherapy Bracelet Dimensions: Length: 18 cm (other sizes available on request). Elasticated, it adapts to all wrists, so it can be worn by the majority of people, regardless of morphology. Diameter of beads: 6 or 8 mm. As each stone is unique, with its own characteristics, the bracelet you will receive may differ slightly from the one in the photo (darker or lighter). About the gem: Sardonyx is a mixture of Sardinian and Onyx, hence its name. A powerful protective stone, sardonyx brings stability and happiness to your couple, it will help you find balance in love.