Rolex Datejust 31 Yellow Rolesor — Champagne Diamond Dial | Ref. 278383RBR

Reference 278383RBR belongs to the current-generation Datejust 31, introduced with the updated 278xxx reference series and powered by Rolex's latest small-calibre movement. The 31 mm Oyster case is fashioned in Yellow Rolesor — Oystersteel paired with 18-carat yellow gold — with the warm-toned precious metal applied to the bezel, winding crown and bracelet centre links, creating a coherent two-tone aesthetic that has defined Rolex's Rolesor concept since the 1930s.

A factory diamond bezel encircles a champagne dial whose warm, gilded surface is set with diamond hour markers: a pairing of mineral and gemstone that allows each element to reinforce the other's luminosity. The champagne ground absorbs and diffuses light in a manner distinct from lacquered or enamel dials, producing a subtly matte warmth that shifts perceptibly under different lighting conditions. The date window, fitted with a Cyclops lens and framed by the matching yellow-gold surround, sits cleanly at three o'clock.

Calibre 2236, Rolex's current self-winding movement for the 31 mm format, is equipped with a Syloxi silicon hairspring — a proprietary component that renders the movement impervious to magnetic fields and delivers a 55-hour power reserve alongside chronometer-grade precision. The Oyster bracelet, with its flat three-piece links and Oysterclasp, provides 100 metres of water resistance and the kind of wearing comfort that comes only from Rolex's rigorous bracelet quality controls.