Rolex Datejust 31 Yellow Rolesor — White Roman Dial | Ref. 278343

Reference 278343, released at Baselworld 2019, marked the transition of the mid-size Datejust to the 31mm case diameter and the introduction of Calibre 2236 across the range. In Yellow Rolesor — Oystersteel combined with 18K yellow gold — the watch presents a two-tone aesthetic rooted in Rolex's Datejust heritage stretching back to the 1950s, when Rolesor combinations first appeared as a way to introduce precious metal accents to a sportier case format.

The 18K yellow gold domed bezel is set with brilliant-cut diamonds in a pavé arrangement, transforming the traditional plain domed profile into a gem-set architectural element without sacrificing the bezel's characteristic low-profile silhouette. The white dial — clean, lacquered, and highly reflective — carries applied Roman numerals in yellow gold, a configuration with deep roots in classical pocket-watch design. The Cyclops-magnified date aperture sits at 3 o'clock. Calibre 2236 within provides COSC-certified precision, approximately 55 hours of power reserve, and a Syloxi silicon hairspring that outperforms traditional metal hairsprings in magnetic and thermal resilience.

The Oyster bracelet in Yellow Rolesor — flat three-piece links in alternating steel and yellow gold — is fitted with a folding Oysterclasp and the Easylink 5mm comfort extension link, enabling quick on-the-fly size adjustments. Reference 278343 in white Roman is the quintessential two-tone Datejust 31: traditional in character, technically current, and unmistakably Rolex.