Rolex Datejust Gold — Silver Diamond Dial | Ref. 278285RBR

Within the Datejust 31 collection, the President bracelet variant of reference 278285RBR represents the most formal of the available configurations — the semi-circular three-piece President links in 18K Everose gold endowing the wrist presence with a sculptural solidity that traces its lineage directly to the Day-Date's foundational 1956 aesthetic. The 31mm Everose case carries a 46-diamond bezel set in grain-mount, its cumulative carat weight creating an unbroken halo of brilliance around the mother-of-pearl dial. Water resistance to 100 metres is maintained by the screw-down Twinlock crown.

Calibre 2236 drives this reference — the same movement that Rolex employs across its medium-diameter ladies' collection and which is distinguished by the Syloxi hairspring, a component manufactured from monocrystalline silicon using photolithographic processes originally developed for the semiconductor industry. This hairspring is immune to magnetic fields up to several hundred gauss and exhibits negligible thermal drift, ensuring the -2/+2 second daily precision rating holds even in real-world wearing conditions. The power reserve of 55 hours provides a comfortable buffer for weekend removal from the wrist.

The silver-toned mother-of-pearl dial is appointed with diamond hour markers in a full twelve-position configuration, each stone individually selected for colour and clarity before setting. The sapphire crystal carries the signature Cyclops magnification lens directly over the date aperture at 3 o'clock, enlarging the numerals to 2.5× their printed size for effortless reading. The concealed Crownclasp of the President bracelet is flush with the bracelet profile when closed, preserving the watch's uninterrupted silhouette on the wrist and making this Datejust 31 one of Rolex's most accomplished exercises in integrated design.