Our beautiful July Birthstone bracelet is made in 18k gold plate with a natural black onyx cabochon stone at its heart. Bring a pop of elegance all year round with this bright, affordable bracelet that makes the perfect birthday present. Black onyx is associated with strength, focus & protection. Bracelet length: 17-20cm. (adjustable for wrist-size) Stone size: 4.5mm. 18k gold plate with E-coat on brass. Black onyx stone. High polish hammered finish. Secure lobster-claw clasp.