Presented in White Rolesor — Rolex's combination of Oystersteel and white gold — the Datejust 31 reference 278384RBR-0002 features a round 31mm case built on Oyster architecture, with a monobloc middle case, solid case back, and a screw-down winding crown protected by the Twinlock double waterproofness system. The bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens over the date window keeps everything clearly legible. Water resistance extends to 100 metres / 330 feet.
The bright black dial is dressed with Roman numeral hour markers, offering bold contrast that reads effortlessly at a glance. The Oystersteel Jubilee bracelet, composed of five-piece links, fastens with a concealed folding Crownclasp for a refined, secure fit at the wrist.
Powering the watch is the perpetual, mechanical, self-winding Calibre 2236, a Manufacture Rolex movement with bidirectional winding via a Perpetual rotor and a power reserve of approximately 55 hours. The oscillator features a Syloxi hairspring in silicon with patented geometry and high-performance Paraflex shock absorbers, delivering a precision of -2/+2 seconds per day after casing. Functions include centre hour, minute, and seconds hands, instantaneous date with rapid setting, and stop-seconds for precise time setting. The movement is COSC certified.
