Housed in a 31 mm round case of Everose Rolesor — Rolex's combination of Oystersteel and Everose gold — the Datejust 31 reference 278271-0001 is built around the classic Oyster architecture: a monobloc middle case, screw-down solid case back, and screw-down winding crown secured by the Twinlock double waterproofness system. The fluted bezel adds definition to the profile, while a scratch-resistant sapphire crystal with Cyclops lens over the date window keeps the dial legible. Water resistance extends to 100 metres / 330 feet.
The white dial carries Roman numeral hour markers and is read through a crisp sapphire crystal. The three-piece solid-link Oyster bracelet shares the same Everose Rolesor composition as the case and fastens with a folding Oysterclasp equipped with the Easylink 5 mm comfort extension link for an adjustable, secure fit.
Inside, the perpetual mechanical self-winding Calibre 2236 — a Manufacture Rolex movement — delivers a precision of -2/+2 seconds per day after casing and an approximate 55-hour power reserve. The oscillator features a Syloxi hairspring in silicon with patented geometry and high-performance Paraflex shock absorbers. Functions include centre hour, minute, and seconds hands, instantaneous date with rapid setting, and stop-seconds for precise time setting. The calibre is COSC certified.
