Feel the mystery and magic of diving in the sea wearing this beautiful one of kind ring. The materials are Blue Opal Petrified Wood, sterling silver, 18k ring is oxidized. The surface size is 1 3/4. x 1. The Ring size is 7 3/4 Please note the fine silver bezel can take on a golden glow from the oxidation process. For care, please do not use a polishing cloth as that can alter the patina. You can swish in warm sudsy water, rinse and dry.