Rolex Datejust 31 White Rolesor — Dark Grey Diamond Dial | Ref. 278344RBR

The Datejust 31 reference 278344RBR exemplifies Rolex's approach to the mid-size category — a 31mm case that sits convincingly on a range of wrist sizes while offering a level of material and decorative complexity reserved for dedicated jewellery references. White Rolesor — Rolex's proprietary combination of Oystersteel and 18-carat white gold — gives this piece its characteristic two-tone character: the case middle in steel, the bezel and crown in white gold. A 24-diamond domed bezel sets the perimeter, while the dark grey dial, itself set with diamond hour markers, creates a sharp tonal contrast that reads as contemporary and assured.

Powering the 278344RBR is the Calibre 2236, Rolex's self-winding movement developed specifically for the mid-size Datejust and Lady-Datejust. It features a Syloxi silicon hairspring — offering improved resistance to magnetic fields and temperature variation — and operates at 28,800 vph with a 55-hour power reserve. The domed bezel profile on this RBR variant adds three-dimensional interest to the case profile, distinguishing it from the flat diamond-set options. The Jubilee bracelet, with its five-piece link construction, provides a supple and comfortable fit appropriate to the watch's dress-oriented purpose.

This reference occupies an interesting market position: technically it is a mid-size ladies' or unisex piece, yet its dark grey diamond dial and diamond bezel give it a stronger presence than many entry-level diamond Rolex references. Buyers who value understated restraint in a gem-set watch — preferring tone-on-tone to high contrast — will find the 278344RBR particularly well resolved. Secondary market demand for Rolesor Datejust 31 references with diamond dials remains consistent, supported by the breadth of the Datejust's collector base.