Rolex Datejust 31 Rolesor — Diamond Bezel & White Mother-of-Pearl Diamond Dial | Ref. 278384RBR

Reference 278384RBR belongs to the current-generation 31mm Datejust family, identifiable by the 278xxx model number prefix that signifies Rolex's updated midsize case architecture introduced in recent years. The white Rolesor construction — combining an Oystersteel case body with white gold crown, bezel, and fluted or diamond-set elements — delivers the aesthetic brightness of precious metal without the full cost of a solid gold build. The diamond bezel paired with a white mother-of-pearl dial set with diamond hour markers creates a comprehensive jewellery presentation in this format.

The 278xxx Datejust 31 is powered by Calibre 2236, which replaced the 2235 in this case size with the updated generation. The 2236 introduces a Syloxi silicon hairspring, improving anti-magnetic resilience and long-term rate stability compared to the Parachrom alloy used in its predecessor. The movement operates to COSC chronometer standards and is certified before leaving the Rolex manufacture.

This reference targets buyers who want a current-production, jewelled Rolex in the midsize format with full factory specifications and the assurance of the modern movement platform. Rolesor configurations represent Rolex's democratic approach to precious metal — genuine white gold components in the most visible positions, at a price point accessible to a broader market than solid gold. The 278384RBR in strong pre-owned condition with papers is consistently sought across secondary market platforms, and its recent production date ensures continued parts and service availability from Rolex authorised service centres for many years.