Mini rock round onyx ring - silverDescription Bororo's signature rock ring in a smaller size with a round pitch black onyx stone. This black onyx ring is as cool as you can imagine, and as elegant as can be. Mini rock rings are perfect for those who love the innovative design of rock rings and want to wear it every day. This ring is extremely gentle on clothing with its smooth, round shaped stone. The pieces in the rock series are made by applying the Japanese traditional method