At 31 mm, this Datejust 31 wears the Oyster architecture at its most refined: a monobloc middle case with screw-down case back and a Twinlock double waterproofness winding crown, delivering water resistance to 100 metres. The case and five-piece-link Jubilee bracelet share the same Everose Rolesor composition — a combination of Oystersteel and Everose gold — finished with a concealed folding Crownclasp. The domed bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens magnifies the date window.
The rosé-coloured dial is marked with Roman numerals, lending a classical character to the design. Powering the watch is the Calibre 2236, a perpetual mechanical self-winding movement from Manufacture Rolex. It features a Syloxi silicon hairspring with patented geometry, high-performance Paraflex shock absorbers, and bidirectional winding via a Perpetual rotor, yielding a power reserve of approximately 55 hours and a precision of -2/+2 seconds per day after casing.
The movement carries Superlative Chronometer certification — meeting both COSC standards and Rolex's own post-casing verification. Functions include centre hour, minute, and seconds hands, instantaneous date with rapid setting, and stop-seconds for precise time adjustment. Reference 278341RBR-0006 represents the Datejust 31 in one of its most distinctive two-tone, diamond-adorned expressions.
