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

Introduced as part of Rolex's 2020 collection refresh, Reference 278240 brings the Datejust 31 into the White Rolesor family — Oystersteel paired with 18k white gold — and presents it with a white dial carrying Roman numeral hour markers. The Roman numerals lend the dial a classically European character that sits comfortably between the sport and dress registers, while the domed bezel (as opposed to a fluted or diamond alternative) keeps the composition clean and restrained.

At the movement level, the 278240 benefits from Calibre 2236 — Rolex's purpose-built movement for the 31mm platform. The 2236 was developed to replace the 2235, incorporating the Syloxi silicon hairspring for improved antimagnetic performance and greater long-term rate stability, along with a 55-hour power reserve. The White Rolesor construction ensures the bracelet — available in Oyster or Jubilee configurations — carries the same material combination as the case, maintaining visual coherence across the full watch.

White Rolesor Datejust 31 references occupy an interesting position: they offer the aesthetic of white gold without the full price premium of an entirely precious-metal case, making them accessible entry points into the higher-tier Datejust family. The Roman dial on the 278240 specifically appeals to buyers who value classical legibility and the association with dress-watch tradition. For the secondary market, the 2020 vintage combined with the current-generation movement makes this a reference with strong long-term fundamentals.