Rolex Datejust 31 White Rolesor — Diamond Bezel, Dark Grey Roman Dial | Ref. 278384RBR

Reference 278384RBR configures the Datejust 31 in White Rolesor — the combination of Oystersteel and 18ct white gold — with a diamond-set bezel and a dark grey dial carrying Roman numeral hour chapters. The RBR suffix in Rolex nomenclature denotes a diamond bezel set with brilliant-cut stones, distinguishing this variant from standard domed or fluted bezel configurations. The dark grey dial with Roman numerals is among the more contemporary and versatile choices in the Datejust 31 range, pairing equally well with the silver tones of white gold and steel.

Inside the 31 mm Oyster case, the Calibre 2236 provides the mechanical foundation — a movement designed specifically for Rolex's ladies' and mid-size references, notable for its Syloxi silicon hairspring that offers both magnetic resistance and thermal stability. Power reserve of 55 hours places it comfortably ahead of many competing calibres in this size category. The Oyster bracelet in matching White Rolesor construction provides secure wearing comfort with the practicality of Rolex's fold-over Oysterclasp, while the diamond bezel adds formal elegance without requiring a precious-metal bracelet.

White Rolesor Datejust 31 references in the current 278-generation represent the refined evolution of a configuration that has been commercially successful since the two-tone concept became a Rolex mainstay. The dark grey Roman dial distinguishes this variant from more numerous silver or white dial examples, making it a stronger candidate for the buyer who wants a Datejust that reads differently on the wrist. Collector interest in diamond-bezel Rolesor references has grown steadily, with original-condition examples showing resilient secondary market pricing.