Rolex Lady-Datejust 26 Black Dial 18K White Gold President Automatic Ladies Diamond Watch 179179BKDP. 18kt white gold case with a 18k white gold Rolex President bracelet. Fixed - fluted 18k white gold bezel. Black dial with silver-tone hands and diamond hour markers. Automatic movement. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case diameter: 26 mm. Round case shape. Concealed Crown clasp. Water resistant at 100 meters / 330 feet. Functions: date, hour, minute, second.