Rolex Datejust White Rolesor — Diamond Bezel Silver Diamond Dial | Ref. 278384RBR

Reference 278384RBR belongs to the current-generation Datejust 31, and in White Rolesor with a diamond-set bezel and silver diamond dial it represents one of the most comprehensively jewelled configurations in this case size. White Rolesor — the combination of 18k white gold for the bezel and bracelet centre links with Oystersteel for the case and outer bracelet — creates a tonal harmony of brilliant white surfaces that allows the diamond-set components to read as a continuous field of light rather than decorative additions. The suffix RBR in the reference number confirms the factory diamond bezel specification.

The movement within the 278xxx reference group is the Calibre 2236, Rolex's current manufacture calibre for the 31mm case size. The 2236 is notable for its incorporation of the Syloxi silicon hairspring, a landmark development that replaces the earlier Parachrom alloy with a component that is both anti-magnetic and entirely impervious to lubricant contamination. The movement is certified as a Superlative Chronometer, meeting Rolex's internal standard of +2/-2 seconds daily deviation after casing — a specification that exceeds the COSC benchmark. The Jubilee bracelet in White Rolesor provides a refined, five-link alternative to the sportier Oyster configuration.

In the secondary market, the 278384RBR is among the most desirable of the current Datejust 31 references, combining the prestige of a factory diamond bezel with the most advanced movement Rolex currently produces for this case diameter. White Rolesor maintains broad appeal across different personal styles, and the diamond configuration ensures this reference retains strong collector interest. Buyers should prioritise examples with all original factory-set diamonds intact and original bracelet in unmarked condition.