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

Reference 278344RBR belongs to the current Datejust 31 generation introduced in 2018, incorporating the updated Oyster case architecture shared with the modern Datejust 36 and 41. The White Rolesor execution pairs Oystersteel with 18-carat white gold, while the domed bezel set with 24 brilliant-cut diamonds introduces a three-dimensional curvature uncommon in standard Datejust bezel configurations. Against this, the black dial with Roman numeral hour markers provides high-contrast legibility — a deliberate design tension between darkness and sparkle that gives this reference a distinctly contemporary character.

Calibre 2236 powers this reference, Rolex's modern in-house movement for the Datejust 31 platform. Introduced to replace the Calibre 2235, the 2236 features a silicon Syloxi hairspring — Rolex's proprietary innovation — offering superior resistance to magnetic fields and improved frequency stability. The 31 mm Oyster case in the 278xxx generation benefits from the refined lug geometry and tighter finishing tolerances of the current-production platform, and the RBR suffix confirms the diamond-set bezel variant as a production designation rather than an aftermarket modification.

For buyers in the pre-owned market, the 278344RBR represents a current-generation Datejust 31 with a compelling combination of specifications: a Syloxi-equipped calibre, a diamond-set domed bezel in white Rolesor, and the visual punch of the black Roman dial. Its modernity relative to the outgoing 178xxx series makes it attractive to those seeking a Datejust with up-to-date movement technology alongside sustained decorative appeal.