Rolex Lady-Datejust 31 Mother Of Pearl Dial 18K Yellow Gold President Automatic Ladies Watch 178278MDP. 18kt yellow gold case with a 18kt yellow gold Rolex president bracelet. Fixed fluted 18kt yellow gold bezel. Mother of pearl dial with yellow gold-tone hands and diamond hour markers. Rolex calibre 2235 automatic movement with a 48-hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case size: 31 mm. Round case shape. Concealed crown clasp. Water resistant at 100 meters / 330 feet. Functions: date, hour, minute, second, chronometer.