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

Reference 278240 is the Datejust 31 in white Rolesor — a pairing of Oystersteel with 18ct white gold that produces a cooler, more understated two-tone aesthetic than the warmer yellow or Everose Rolesor configurations. White Rolesor blends seamlessly across the case and bracelet, making the transition between metals far less pronounced than in yellow or rose gold variants, and lending the watch a near-monochromatic quality that suits a wide range of wrist profiles and personal styles. The dark grey index dial reinforces this restrained character, presenting deep charcoal tones that work handsomely against the polished white gold bezel.

Calibre 2236, Rolex's dedicated self-winding movement for the 31 mm case format, provides the movement. With its Syloxi hairspring — a proprietary silicon alloy that offers magnetic resistance and thermal precision without a traditional paramagnetic metal — Cal. 2236 represents the engineering foundation of the modern Lady-Datejust and Datejust 31 family. The 31 mm Oyster case is water-resistant to 100 metres, paired here with either the Jubilee or Oyster bracelet depending on specification, both available in matching Rolesor construction.

The 278240 in white Rolesor with dark grey index dial is a particularly versatile specification — one that reads as clean and modern without the visual noise of diamond settings or the warmth of yellow gold. Collectors who want a Datejust 31 that transitions easily from day wear to evening settings without demanding attention will find this configuration ideal. Dark grey dials across the Datejust line have shown consistent appreciation in the secondary market, and the white Rolesor case material has attracted growing interest among buyers seeking refined, low-contrast precious-metal pieces.