Rolex Yellow Gold Datejust 31 Watch - Fluted Bezel - Dark Mother-of-Pearl Diamond Dial - Oyster Bracelet - 278278 dkmdo31mm 18K yellow gold case, screw down crown with twinlock double waterproofness system, fluted bezel, scratch resistant sapphire crystal with cyclops lens over the date, dark mother of pearl dial, 10 diamond hour markers, Rolex calibre 2236 automatic movement with center hour, minute and seconds hands, instantaneous date with rapid setting, and stop seconds for precise time setting, approximately 55 hours of power reserve, 18K yellow gold Oyster