Rolex Lady-Datejust 28 Yellow Gold — White Roman Dial, 44-Diamond Bezel | Ref. 279138RBR

The 279138RBR designates a Lady-Datejust 28 in full 18ct yellow gold with a factory-set 44-diamond bezel — a specification that positions this reference at the highest gem-density tier in the current 28mm range. The "RBR" suffix confirms that the diamond bezel is a Rolex factory configuration, not an aftermarket modification, which is a distinction of significant consequence in both authentication and resale contexts. A white dial with Roman numeral hour markers provides contrast against the yellow gold case, offering legibility within a composition that leans toward the decorative. Roman numerals have deeper historical roots in dress watchmaking than stick or baton indices, lending this dial a more classically jewelled-watch character.

Calibre 2236 powers this reference. Introduced to replace the earlier 2235, it brings a silicon Syloxi hairspring to the Lady-Datejust platform — an advance in magnetic resistance and long-term precision that aligns the smaller Rolex movements with the standards set by the larger calibres. The 28mm full yellow gold Oyster case, measuring 28mm in diameter, is compact by contemporary standards and consistent with the Lady-Datejust's historical profile. A President bracelet in 18ct yellow gold is the expected bracelet pairing for a full-gold reference of this specification.

Buyers evaluating 279138RBR should note that factory RBR bezels command a meaningful premium over smooth or fluted bezel equivalents in the secondary market, and yellow gold examples with Roman dials are among the more formal configurations in the current range. This reference appeals to collectors who prioritise complete factory presentation and the legitimacy of in-house gem-setting over aftermarket customisation. Full box and papers materially affect resale value for a reference at this price tier.