.One of a kind lovely beautiful blue earrings to wear anywhere. The materials are sterling silver, fine silver bezels, blue opal petrified wood, 18k and French hooks. Please note the fine silver bezels 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. the size is 2 1/2 x 2.