Rolex Lady-Datejust Yellow Gold — Silver Dial with 44-Diamond Bezel | Ref. 279138RBR

Reference 279138RBR represents the Lady-Datejust 28 at its most jewelled, clothing the 28 mm Oyster case entirely in 18 ct yellow gold and adorning it with a brilliant-cut 44-diamond bezel that transforms the watch into a piece of wearable jewellery without sacrificing a single second of horological integrity. The silver dial beneath retains classic index hour markers, providing a clean counterpoint to the exuberance of the factory diamond setting — a balance Rolex's designers achieve with studied restraint.

Inside, Calibre 2236 — Rolex's dedicated manufacture movement for the Lady-Datejust 28 — delivers precision and reliability in a compact movement architecture. The calibre features a Syloxi hairspring, crafted in-house from a silicon-based material that provides superior isochronism and resistance to shocks, temperature fluctuations, and magnetic fields compared to traditional metal alloys. Winding is bidirectional via a perpetual rotor, while the Superlative Chronometer certification ensures post-casing accuracy within ±2 seconds per day across the full range of wearing positions.

For the collector, 279138RBR occupies the upper tier of the Lady-Datejust reference family — a full yellow gold, diamond-set piece that speaks to Rolex's dual identity as watchmaker and jeweller. Yellow gold Datejusts with RBR (Ruby-Bezel-Rainbow) or standard diamond bezels have demonstrated strong long-term desirability, particularly among buyers who appreciate Rolex's uncompromised gem-setting standards. This reference suits both the curated jewellery watch collection and the broader Datejust study seeking representation across case metals and sizes.