Rolex Datejust Yellow Rolesor — Dark Grey Diamond Dial | Ref. 278383RBR

The Datejust 31 in reference 278383RBR occupies a precise position in Rolex's size matrix — larger than the 28 mm Lady-Datejust yet more restrained than the 36 mm unisex configuration — and renders the Rolesor formula in yellow gold and Oystersteel with a diamond-set bezel crowning a dark grey dial paved with brilliant-cut diamond hour markers. The deep slate tone of the dial creates an authoritative contrast with the warm yellow gold accents, a pairing that reads as understated luxury rather than overt decoration. Beneath the sapphire crystal, the Calibre 2236 self-winding movement provides 55 hours of autonomy with a Syloxi hairspring for enhanced antimagnetic performance.

Rolex introduced the 31 mm case size to bridge the traditional ladies' and unisex market segments, and 278383RBR is among the most jewelled expressions of that size. Each diamond in the bezel is individually set by hand in a groove cut by laser to precisely accept the stone — a process that eliminates adhesives and ensures long-term security. The Jubilee bracelet, with its five-piece link construction and concealed Oysterclasp, provides both suppleness on the wrist and visual alignment with the dress-watch heritage of the Datejust lineage.

At 31 mm the case retains the full-depth Oyster construction and 100 metres of water resistance, features that distinguish Rolex's gem-set offerings from pure jewellery watches of comparable price. The combination of dark grey diamond dial and yellow Rolesor is a relatively rare configuration, making complete examples with original box and papers especially sought after among systematic Datejust collectors.