Rolex Datejust 31 Yellow Rolesor — Champagne Diamond Dial | Ref. 278243

Reference 278243 brings the Datejust 31 into the Rolesor register — the combination of Oystersteel and 18ct yellow gold that Rolex has employed to bridge the gap between steel sports watches and full precious-metal dress pieces since the 1940s. At 31 mm, this case diameter occupies the middle ground of the Datejust family, suiting wrists that find the 28 mm Lady-Datejust too delicate and the 36 mm too assertive. The champagne dial set with diamond hour markers renders it firmly in dress-watch territory.

Powering the 278243 is the Calibre 2236, Rolex's dedicated ladies' and mid-size movement introduced in 2015. Its Syloxi silicon hairspring, proprietary to Rolex, resists magnetism and thermal fluctuation while contributing to a 55-hour power reserve — a significant improvement over the movements it replaced. The Oyster case in steel and yellow gold carries the full 100-metre water resistance standard, and the bracelet configuration on this reference completes the Rolesor look with matching two-tone construction.

Datejust 31 references in Rolesor with diamond dials appeal to buyers who want genuine horological substance without the full commitment to precious metal pricing. The champagne diamond dial variant is among the more versatile options in the range — warm enough to read as jewellery, restrained enough for daily wear. On the secondary market, condition and originality of the dial diamond setting drive value; examples free of refinishing or bezel replacement are appreciably more desirable.