Rolex Datejust 28 Platinum — 44-Diamond Bezel, Silver Diamond Star Dial | Ref. 279136RBR

Platinum is the rarest and most demanding of the precious metals used in watchmaking, and Rolex's use of it for the Lady-Datejust 28 reference 279136RBR reflects a standard of material purity commensurate with the watch's extraordinary dial. The 28 mm platinum case is encircled by a domed bezel set with 44 brilliant-cut diamonds, while the silver dial deploys nine diamonds in star-shaped hour marker settings alongside a further eight diamonds forming the Roman numeral IX — a configuration of gemological complexity executed with the lapidary precision for which Rolex's dial workshop is internationally regarded.

Calibre 2236, Rolex's dedicated manufacture movement for the Lady-Datejust 28 and Datejust 31 formats, oscillates at 28,800 vph and delivers approximately 55 hours of power reserve from its efficiently wound mainspring. The Syloxi hairspring — manufactured in-house from silicon and shaped by photolithographic process for absolute dimensional consistency — provides the movement with thermal stability and magnetic resistance that mechanical hairsprings of traditional alloys cannot match. The instantaneous date mechanism with rapid-setting and stop-seconds reflects the same functional standards demanded of Rolex's professional sport watches.

The platinum President bracelet — with semi-circular three-piece links and concealed Crownclasp — provides a wearing experience of considerable density and weight characteristic of the metal, while the sapphire crystal with Cyclops magnification and double anti-reflective coating ensures both legibility and scratch resistance in daily wear. The pairing of platinum's cool grey lustre with the diamond constellation of the dial produces a timepiece of extraordinary jewellery-grade refinement — a watch that transcends purely horological appreciation to function as a masterwork of the lapidary arts.