Reference 279138RBR-0021 presents the Lady-Datejust 28 in an 18kt yellow gold round case measuring 28mm across. The bezel is set with 44 brilliant-cut diamonds, while a scratch-resistant sapphire crystal with a Cyclops lens over the date window sits above the champagne-colour dial dressed with Roman numeral hour markers. The Oyster architecture — monobloc middle case, screw-down case back, and screw-down Twinlock winding crown — delivers waterproofness to 100 metres / 330 feet.
Inside runs the Rolex Calibre 2236, a perpetual mechanical self-winding movement manufactured by Rolex. It features a Syloxi silicon hairspring with patented geometry, Paraflex shock absorbers, bidirectional winding via a Perpetual rotor, and a power reserve of approximately 55 hours. Precision is rated at -2/+2 seconds per day after casing, and the movement is COSC certified. Functions include centre hour, minute, and seconds hands, an instantaneous date with rapid setting, and stop-seconds for accurate time setting.
The watch is carried on an 18kt yellow gold President bracelet with semi-circular three-piece links and a concealed folding Crownclasp, completing a cohesive all-gold presentation suited to the Lady-Datejust's longstanding character.
