Rolex Lady-Datejust 28 Yellow Gold Diamond Bezel — Silver Roman Dial | Ref. 279138RBR

Reference 279138RBR is a Lady-Datejust 28 in full 18ct yellow gold, defined by its 44-diamond factory bezel and a silver dial presenting Roman numeral hour markers. The 279xxx series brought a calibre upgrade and dimensional refinement to the ladies' Datejust line, and the RBR suffix designates the diamond bezel as Rolex-factory specification — a distinction with meaningful implications for value and provenance. Yellow gold at 28mm achieves a proportion that is genuinely jewellery-like: the case disappears beneath the glitter of the diamond bezel, and the silver Roman dial provides the only sober visual element in an otherwise exuberant composition.

At its core sits the Calibre 2236, Rolex's modern self-winding movement for the 28mm case, incorporating a Syloxi silicon hairspring for outstanding thermal stability and magnetic resistance. The movement's precision certifications align with Rolex's broader standard, ensuring this reference functions as an accurate daily timepiece rather than merely a wearable ornament. The 44-diamond bezel is set using Rolex's in-house gem specialists under controlled grading conditions, and the yellow gold case — brushed on the flanks, polished on the lugs — demonstrates the kind of multi-finish execution that requires skilled hands to maintain in service.

Collectors of gem-set Rolex references in yellow gold should note that 279138RBR examples in full factory-unworn condition are increasingly difficult to source as the broader market for luxury watches tightens. Roman numeral dials on this reference are marginally less common than index dials, which can create a modest collector premium for buyers who know to look for it. Complete box and paper sets, ideally with the accompanying Rolex warranty card, are non-negotiable for buyers intending to hold the reference as a long-term investment.