At 28 mm, the Lady-Datejust ref. 279173-0009 is built around an Oyster case in Yellow Rolesor — Rolex's own term for the combination of Oystersteel and yellow gold. The fluted bezel frames a scratch-resistant sapphire crystal fitted with a Cyclops lens over the date, while a screw-down winding crown with the Twinlock double waterproofness system and a solid case back contribute to water resistance rated to 100 metres / 330 feet.
The champagne-colour dial carries Roman numeral hour markers, giving the piece a classically legible character. Beneath is the Calibre 2236, a perpetual mechanical self-winding movement produced by Rolex, beating to a precision of -2/+2 seconds per day after casing. A Syloxi silicon hairspring with patented geometry and Paraflex shock absorbers are among its engineering highlights, while bidirectional winding via the Perpetual rotor provides approximately 55 hours of power reserve. The movement holds Superlative Chronometer status, reflecting both COSC certification and Rolex's own post-casing testing.
The Yellow Rolesor Jubilee bracelet — also a blend of Oystersteel and yellow gold — features five-piece links and fastens with a concealed folding Crownclasp, completing a watch that balances refined aesthetics with robust mechanical credentials.
