Rolex Datejust 31 Yellow Rolesor — Domed Bezel Silver Diamond Roman Six | Ref. 278243

Yellow Rolesor — Rolex's registered term for the combination of Oystersteel and 18 ct yellow gold deployed across a single watch — brings an inherently democratic luxury to the Datejust 31, a size that has occupied a definitive middle position in the Datejust range since its introduction. Reference 278243 applies Rolesor logic to its fullest extent: the case middle and Oyster bracelet outer links are rendered in Oystersteel for durability and corrosion resistance, while the bezel, crown, and bracelet centre links are executed in yellow gold, creating a two-tone visual rhythm that distributes warmth across the dial register without the full commitment of an all-precious-metal watch.

The domed bezel — a smooth, convex profile that differs from the fluted and diamond variants elsewhere in the Datejust range — frames a silver dial on which the hour markers at positions 1 through 5 and 7 through 12 are diamond-set, with position 6 occupied by a bold Roman numeral that anchors the layout and provides an unmistakable axis of symmetry. This partial diamond configuration, known as Diamond Roman Six, is among the most restrained gem-set dial specifications in the range: present enough to register as jewellery, absent enough that the dial's legibility is preserved entirely.

Calibre 2236 governs the Datejust 31, its Syloxi silicon hairspring delivering resistance to both magnetic fields and temperature fluctuations that traditional Glucydur-sprung movements cannot match, while the 55-hour power reserve ensures continuous operation across a full weekend without winding. The Oyster bracelet's Oysterclasp with Easylink comfort extension system allows the wearer to lengthen the bracelet by approximately 5 mm at the clasp — a feature whose utility in varying ambient temperatures the experienced watch wearer will immediately appreciate.