Housed in a 31 mm Oyster case crafted from Yellow Rolesor — Rolex's combination of Oystersteel and yellow gold — the Datejust 31 features a monobloc middle case, screw-down case back, and a screw-down winding crown with Twinlock double waterproofness, offering water resistance to 100 metres. The bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens magnifies the date display.
The dial presents black mother of pearl adorned with diamonds set in 18 kt gold settings, lending depth and brilliance to the face of the watch. Hour, minute, and seconds hands are joined by an instantaneous date with rapid setting and a stop-seconds function for precise time adjustment. The three-piece solid-link Oyster bracelet, also in Yellow Rolesor, secures with a folding Oysterclasp equipped with an Easylink 5 mm comfort extension link.
Powering the watch is Calibre 2236, a perpetual mechanical self-winding movement by Rolex, featuring a Syloxi silicon hairspring with patented geometry and Paraflex shock absorbers. It delivers a precision of -2/+2 seconds per day after casing, qualifies as a Superlative Chronometer — meeting both COSC and Rolex's own post-casing certification — and offers a power reserve of approximately 55 hours via bidirectional winding through the Perpetual rotor.
