Rolex Datejust 31 White Rolesor — Black Roman Dial, Domed 24-Diamond Bezel | Ref. 278344RBR

The 278344RBR is part of Rolex's current-generation Datejust 31 family, distinguished by its domed 24-diamond bezel and a black Roman numeral dial executed in White Rolesor. The domed bezel profile is a subtle but meaningful design choice — it provides depth and curvature to the upper case architecture, contrasting with the flatter geometry of fluted alternatives. White Rolesor, uniting Oystersteel with 18-carat white gold, gives the piece a cooler, more metropolitan appearance than Everose counterparts, while the black dial delivers strong contrast against the white gold tonal family.

The calibre fitted to the 278xxx series is the 2236, Rolex's newest self-winding manufacture movement designed specifically for the 31 mm platform. Launched to replace the 2235, the 2236 introduces a silicon Syloxi hairspring — Rolex's proprietary material offering superior resistance to magnetic fields and thermal variation compared to Parachrom — alongside approximately 55 hours of power reserve and a beating rate of 28,800 vph. The Oyster case remains water-resistant to 100 metres, and the bracelet options available for this reference — Jubilee or Oyster — each suit the dial's refined character differently.

Within the current Datejust 31 lineup, the 278344RBR with black Roman dial occupies a position of restrained luxury: gem-set enough to signal jewellery intent, but anchored by a legible, traditional dial layout. Roman numerals project a classical European sensibility favoured by buyers who find index dials overly understated. The diamond bezel adds considerable retail value, and the current production status ensures strong after-sales support. Buyers comparing the 278344RBR to older 178344 variants will notice the movement upgrade as the primary differentiator.