Rolex Datejust 31 White Rolesor — White Roman Dial | Ref. 278240

Reference 278240 brings a crisp, cool sophistication to the Datejust 31 through its White Rolesor construction—a pairing of 18-carat white gold with Oystersteel that lends the watch a seamlessly unified, monochromatic character. White Rolesor places white gold at the bezel and bracelet centre links, with Oystersteel forming the case middle and outer bracelet links, a distinction that becomes apparent upon close inspection but reads at a glance as a single harmonious material. The domed bezel in white gold provides a clean, unadorned frame that keeps the focus on the dial.

The white dial is furnished with applied Roman numerals in polished metal, a classically elegant choice that references the tradition of fine dress watches while maintaining the legibility for which the Datejust is celebrated. Roman numerals introduce a literary quality to the dial, their form recalling the heritage of Swiss pocket watchmaking translated into the Rolex idiom. The date aperture at three o'clock, beneath its familiar Cyclops lens, completes the dial in the functional manner that has defined this reference family since 1945.

Inside beats the Calibre 2236, Rolex's dedicated manufacture movement for this case size, notable for its silicon Syloxi hairspring—a component machined by Rolex to precise tolerances for superior anti-magnetic performance and long-term rate stability. The movement delivers a 55-hour power reserve and is certified as a Superlative Chronometer to ±2 seconds per day. The Jubilee bracelet in White Rolesor provides a five-link, softly contoured fit, while the Oyster case is waterproof to 100 metres.