At 31 mm, this Datejust 31 is built around a monobloc middle case crafted in Yellow Rolesor — Rolex's combination of Oystersteel and yellow gold — and sealed with a screw-down case back and screw-down Twinlock winding crown for waterproofness to 100 metres. A domed bezel frames scratch-resistant sapphire crystal with a Cyclops lens magnifying the date display.
The dark grey dial is set with diamonds held in 18 kt gold settings, lending quiet depth and sparkle to the face. Hour, minute, and seconds hands work alongside an instantaneous date with rapid setting and a stop-seconds function for precise adjustment. The Jubilee bracelet, also rendered in Yellow Rolesor with five-piece links, fastens via a concealed folding Crownclasp.
Power comes from Rolex Calibre 2236, a perpetual mechanical self-winding movement featuring a Syloxi silicon hairspring with patented geometry and Paraflex shock absorbers. It delivers a precision of -2/+2 seconds per day after casing, an approximately 55-hour power reserve, and carries Superlative Chronometer certification — meeting both COSC standards and Rolex's own post-casing testing.
