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Rolex · Family: Lady-Datejust
The Rolex Lady-Datejust 28 (ref. 279173) pairs Oystersteel with 18kt yellow gold (Rolesor) in a 28mm case, with a gold fluted bezel and a 5-link Jubilee bracelet. It runs the in-house Calibre 2236, with an antimagnetic Syloxi hairspring and ~55 hours of power reserve. Cazador has zero verified price observations today. Its differential: it's the only Datejust family that uses Calibre 2236 rather than the 3235 fitted to the 36mm and 41mm versions — a movement built specifically for smaller cases.
Insufficient data
1 of 5 price observations needed to show a reliable range
Insufficient data: 1 PricePoints recorded as of today. Cazador does not estimate or infer a market range without sourced observations.
The Lady-Datejust is the smallest-diameter variant within Rolex's Datejust family, cased at 28mm versus the 31mm, 36mm, or 41mm of the other versions. Reference 279173 combines Oystersteel with 18kt yellow gold — the combination Rolex calls Rolesor — on the fluted bezel and part of the bracelet.
What technically sets this family apart is the movement: Calibre 2236, an in-house Rolex movement built specifically for smaller-diameter cases, distinct from the Calibre 3235 fitted to the 36mm and 41mm Datejust. The 2236 uses the Syloxi hairspring, made of silicon, insensitive to magnetic fields and less sensitive to temperature variation and gravitational effects than a traditional metal hairspring. The result is roughly 55 hours of power reserve, with Superlative Chronometer certification.
The fluted bezel, in 18kt yellow gold, is one of the visual traits most associated with the entire Datejust family, including this Lady variant. The crystal is sapphire, with Rolex's signature Cyclops lens over the date window.
The Jubilee bracelet, with its five links, is built on this reference in Rolesor configuration as well, combining Oystersteel and yellow gold. The dial on this reference is offered in multiple color variants depending on sales configuration; the catalog input reviewed does not fix a single dial color for the 279173.
Rated to 100 meters of water resistance, the Lady-Datejust 28 covers daily wear without a sport mandate. Per the catalog data used for this fiche, the 279173 remains in active production. Cazador does not have a precisely verified launch year for this exact combination and avoids stating a specific date without documentary support.
Cazador has no verified PricePoint observations for the 279173, so we cannot publish a reliable market range.
The main difference is case size — 28mm versus 36mm — and the movement: the Lady-Datejust uses Calibre 2236 with a Syloxi hairspring, while the Datejust 36 runs Calibre 3235.
It's an in-house Rolex movement designed for small cases, with an antimagnetic silicon Syloxi hairspring. It delivers roughly 55 hours of power reserve and Superlative Chronometer certification.
Rolesor is Rolex's term for cases combining Oystersteel with gold — on this reference, 18kt yellow gold on the fluted bezel and part of the Jubilee bracelet.
Yes. Rolex offers this refCode across multiple dial-color variants depending on sales configuration, rather than a single fixed color.
It's rated to 100 meters, sufficient for daily wear, rain, and recreational swimming, without a dive-watch mandate.
It ships on a 5-link Jubilee bracelet, in Rolesor configuration combining Oystersteel and 18kt yellow gold.