Rolex Datejust 31 Yellow Gold — Olive Green Diamond Six Dial | Ref. 278278

The Datejust 31 in solid 18 ct yellow gold with a fluted bezel represents one of the most classically elegant configurations in the entire Rolex catalogue — a form-follows-function design whose proportions have remained essentially unchanged since the introduction of the mid-size format. Reference 278278 presents the 31 mm Oyster case in full yellow gold, the fluted bezel — its twenty grooves reflecting light in precisely calibrated angles — providing both aesthetic continuity with the 1945 original and the practical function of compressing the bezel against the crystal gasket to reinforce water resistance. The Oyster bracelet, entirely in yellow gold, completes the ensemble.

The calibre within is Rolex's Calibre 2236, a movement conceived specifically for the mid-size Datejust and distinguished by the incorporation of the Syloxi hairspring — a Rolex-patented silicon component whose parabolic terminal curves ensure consistent isochronism across the full arc of oscillation. The movement oscillates at 28,800 vph with a 55-hour power reserve, and its Paraflex shock absorbers provide the balance wheel with mechanical protection against the inevitable impacts of daily wear. Chronometric performance is certified to COSC standards.

The olive green dial with diamond hour markers and a prominent diamond at the six o'clock position is a configuration that has gained considerable favour among collectors seeking colour-forward alternatives to the traditional white and silver dials. The organic, slightly muted green — reminiscent of aged patina on bronze military instruments — contrasts vividly with the warmth of yellow gold case and bracelet, while the brilliant-cut diamond markers distribute light across the dial surface in a manner that changes character entirely under different lighting conditions. The Cyclops-magnified date at three o'clock maintains practical legibility without interrupting the jewelled composition.