Housed in a 28mm Oyster case built from Yellow Rolesor — Rolex's combination of Oystersteel and yellow gold — the Lady-Datejust 279383RBR-0001 features a monobloc middle case, screw-down case back, and a screw-down Twinlock winding crown offering waterproofness to 100 metres. The bezel is set with diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens over the date window sits above the champagne-colour index dial.
Power comes from the Calibre 2236, a perpetual, mechanical, self-winding movement produced by Rolex. The oscillator uses a Syloxi silicon hairspring with patented geometry and high-performance Paraflex shock absorbers, delivering a precision of -2/+2 seconds per day after casing and a power reserve of approximately 55 hours. Bidirectional winding is handled by a Perpetual rotor, and the movement holds Superlative Chronometer certification — reflecting both COSC testing and Rolex's own post-casing standards.
The watch is worn on a Jubilee bracelet of five-piece links in Yellow Rolesor, secured by a concealed folding Crownclasp. Centre hour, minute, and seconds hands are joined by an instantaneous date with rapid setting and a stop-seconds function for precise time adjustment.
