Rolex Datejust 31 White Rolesor — Dark Grey Index Dial with 24-Diamond Domed Bezel | Ref. 278344RBR

White Rolesor — the artful marriage of 904L Oystersteel and 18-karat white gold — defines Reference 278344RBR of the Datejust 31, a watch that bridges accessibility and luxury with characteristic Rolex confidence. The domed bezel, set with 24 round brilliant diamonds, adds concentrated brilliance to the 31mm case without overwhelming its clean proportions. Against this, the dark grey dial offers a sophisticated, near-masculine counterpoint, its index hour markers delivering crisp legibility beneath the sapphire crystal's Cyclops magnifier.

Calibre 2236 — the movement Rolex developed expressly for mid-size Datejust references — powers the watch with a silicon Syloxi hairspring at its core, providing magnetic resistance far superior to traditional metallurgical alloys. The self-winding bidirectional rotor winds the mainspring with equal efficiency in either direction of rotation, maintaining the approximately 55-hour power reserve that ensures chronometric continuity through the night and into the following day.

The Jubilee bracelet in Oystersteel, with its elegant five-piece link architecture, was created specifically for the first Datejust in 1945 and remains the bracelet most intimately associated with the reference. The concealed folding Crownclasp at the clasp end provides a seamless finish, while the screw-down crown with Twinlock double waterproofness system guarantees protection to 100 metres — technical assurances that reinforce what is already a masterful composition in contrasting metal and diamond brilliance.