At 28 mm, the Lady-Datejust 279174-0012 is built around an Oyster case crafted in White Rolesor, Rolex's term for the pairing of Oystersteel and white gold. The fluted bezel frames a dark grey dial equipped with a Chromalight display, whose long-lasting blue luminescence keeps the hands and indices clearly readable in low light. A scratch-resistant sapphire crystal with a Cyclops lens over the date window sits above the dial, while the screw-down winding crown with Twinlock double waterproofness system contributes to water resistance rated to 100 metres / 330 feet.
Inside, Rolex Calibre 2236 — a perpetual, mechanical, self-winding movement — delivers a precision of -2/+2 seconds per day after casing, backed by Superlative Chronometer certification (COSC plus Rolex certification after casing). The oscillator features a Syloxi silicon hairspring with patented geometry alongside Paraflex shock absorbers, and bidirectional winding via the Perpetual rotor provides a power reserve of approximately 55 hours. Functions include centre hour, minute, and seconds hands, an instantaneous date with rapid setting, and stop-seconds for precise time setting.
The watch is worn on an Oystersteel Oyster bracelet composed of three-piece solid links, secured by a folding Oysterclasp with an Easylink 5 mm comfort extension link for on-the-fly adjustability.
