Rolex Datejust 31 White Rolesor — Black Index Dial | Ref. 178344

Reference 178344 presents the Datejust 31 in White Rolesor — a two-tone construction combining 18ct white gold on the case, crown, and bezel with Oystersteel on the bracelet's outer links — with a 24-diamond bezel and a black dial with index markers. The White Rolesor configuration is one of the more quietly sophisticated two-tone combinations in the Rolex range: without the warmth of yellow Rolesor or the pink note of Everose, the white gold elements read almost as a tonal variant of the steel rather than a sharp contrast. The 24-diamond bezel adds brilliance without the full statement of an all-diamond surround.

Inside the 31mm Oyster case, Calibre 2235 handles timekeeping duties — a self-winding manufacture movement with Parachrom hairspring, bidirectional winding, and a 48-hour power reserve. The 178xxx reference series predates the current 278xxx generation, and the upgrade to Calibre 2236 that accompanied the new series is the primary mechanical distinction between pre-owned 178344 examples and the current-generation equivalents. Water resistance is maintained at 100 metres via the Twinlock screw-down crown and sealed Oyster case architecture.

The black dial with index markers is a compelling choice in this configuration: where many diamond-bezel Datejust variants lean into champagne, silver, or mother-of-pearl to amplify the jewellery character, the black dial creates depth and contrast that gives the watch an evening-wear suitability uncommon in mid-size pieces. Buyers acquiring the 178344 on the secondary market should treat it as a transitional reference — technically sound, competitively priced against the current 278xxx generation, and offering the same essential aesthetic in a movement that predates the Syloxi hairspring upgrade.