Rolex Datejust 31 White Rolesor — Dark Grey Index Dial | Ref. 278240

The Datejust 31 in reference 278240 occupies a precisely calibrated position in Rolex's core lineup — large enough to read with authority, compact enough to sit elegantly on a range of wrist sizes. The White Rolesor configuration pairs an Oystersteel case with an 18-carat white gold bezel, a combination that delivers the visual warmth of precious metal without committing entirely to it. The dark grey index dial presents a restrained, contemporary aesthetic: applied hour markers in white gold catch light with subdued brilliance, creating depth without ostentation.

Inside the 31 mm Oyster case sits Calibre 2236, a movement developed specifically for Rolex's mid-size ladies' references. It incorporates a Syloxi hairspring — a silicon innovation resistant to magnetic fields and temperature variation — along with Rolex's Parachrom Bleu balance spring in earlier production runs. A Chronergy escapement improves energy efficiency, and the movement is certified as a Superlative Chronometer to ±2 seconds per day. The case itself is waterproof to 100 metres, with a screw-down Triplock crown and double-sealed Oysterlock bracelet clasp.

For collectors and buyers, the 278240 White Rolesor configuration in dark grey represents one of the more understated choices in a reference that spans an enormous range of dial and bezel combinations. Grey dials carry real staying power in the secondary market — they photograph well, age gracefully, and avoid the seasonal fluctuations that affect brighter colourways. This reference suits a buyer who wants a daily-wear dress watch that bridges professional and social contexts without visual compromise.