Rolex Datejust 31 White Rolesor — Dark Grey Roman Dial, Diamond Bezel | Ref. 278384RBR

Reference 278384RBR belongs to the current-generation 31 mm Datejust lineup introduced alongside the calibre 2236 movement, identifiable by the 278xxx reference prefix. This White Rolesor configuration pairs a factory diamond bezel with a dark grey dial carrying Roman numeral hour markers — a combination that leans toward the classical side of Rolex's design language while retaining the sparkle that defines the jewellery-forward tier of the Datejust range.

The Calibre 2236 inside offers meaningful advances over its 2235 predecessor: a Syloxi silicon hairspring improves antimagnetic performance and long-term rate stability, while the 55-hour power reserve provides additional autonomy. White Rolesor construction — Oystersteel paired with 18 ct white gold — keeps the palette cool and consistent with the grey tonal register of the dial. The Jubilee bracelet in matching materials provides the characteristic five-link comfort associated with dresswear Datejust references.

The RBR designation confirms a factory-fitted diamond bezel, essential for full value retention. Dark grey Roman dials occupy a particular niche among Datejust enthusiasts who find the blue and silver configurations overly common — the darker ground offers a degree of distinction at a glance. Current-generation 278xxx references with diamond bezels and desirable dial configurations face consistent demand and constrained authorised dealer availability.