Presented in a 31 mm round case crafted from White Rolesor — Rolex's combination of Oystersteel and white gold — this Datejust 31 features a monobloc middle case, solid case back, and a screw-down winding crown equipped with the Twinlock double waterproofness system. The domed bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens over the date window sits above the vivid bright blue dial with Roman numeral hour markers. Water resistance is rated to 100 metres / 330 feet.
Inside beats Rolex Calibre 2236, a perpetual, mechanical, self-winding movement with bidirectional winding via a Perpetual rotor. The oscillator features a Syloxi silicon hairspring with patented geometry alongside high-performance Paraflex shock absorbers, delivering a precision of -2/+2 seconds per day after casing and a power reserve of approximately 55 hours. 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.
The watch is worn on an Oystersteel Jubilee bracelet composed of five-piece links and secured by a concealed folding Crownclasp, lending the reference 278344RBR-0036 its refined, enduring character.
