Housed in a round 31mm case crafted from 18kt yellow gold, the Datejust 31 ref. 278288RBR-0032 features Rolex's Oyster architecture — a monobloc middle case paired with a screw-down case back and screw-down winding crown employing the Twinlock double waterproofness system. The diamond-set bezel frames a scratch-resistant sapphire crystal fitted with a Cyclops lens over the date, and the watch is waterproof to 100 metres / 330 feet.
The black mother-of-pearl dial is itself set with diamonds mounted in 18kt gold settings, lending depth and brilliance to the face. Powering the watch is the Calibre 2236, a perpetual mechanical self-winding movement manufactured by Rolex. It delivers a precision of -2/+2 seconds per day after casing, a power reserve of approximately 55 hours, and incorporates a Syloxi silicon hairspring with patented geometry alongside Paraflex shock absorbers. Functions include centre hour, minute, and seconds hands, an instantaneous date with rapid setting, and stop-seconds for precise time adjustment. The movement is COSC certified.
The watch rides on the President bracelet in 18kt yellow gold, constructed with semi-circular three-piece links and secured by a concealed folding Crownclasp — a combination that has long defined the Datejust's most formal expression.
