Rolex Datejust Lady 31 31 mm 278240BSDBJ Steel/White Gold/Diamonds Black Rolex Datejust Lady 31 31 mm 278240BSDBJ…

The Rolex Datejust Lady 31 reference 278240BSDBJ is one of the most refined expressions of a watch design that has defined luxury timekeeping since 1945. The Datejust was the first self-winding wristwatch to display the date in a window at 3 o'clock, and that pioneering spirit has translated into a lineage that remains at the very heart of the Rolex catalog. The 31mm case size was introduced to give wearers who prefer a more substantial presence on the wrist—yet still elegant and feminine—the full Datejust experience without crossing into the larger 36mm territory.

The case and crown of the 278240BSDBJ are constructed in Oystersteel, Rolex's proprietary 904L stainless steel alloy prized for its exceptional corrosion resistance and high-polish luster. White gold accents complement the steel, lending the piece a two-tone sophistication that reads as decidedly upscale. The combination of these materials is a hallmark of Datejust references that sit at the intersection of sportiness and haute horlogerie.

The black dial is the defining visual statement of this particular reference. Deep, lacquer-rich, and punctuated by index hour markers, it provides a dramatic backdrop that makes the hands highly legible while simultaneously projecting a confident, dress-ready aesthetic. The custom diamond-set bezel encircles the dial with a continuous ring of brilliant-cut stones, catching and scattering light in a way that transforms the watch from a precision instrument into a wearable jewel.

Powering the 278240BSDBJ is a Rolex automatic movement, the self-winding engine that has made the Datejust a reliable daily companion for generations of collectors. The watch offers 100 meters (330 feet) of water resistance courtesy of its Oyster case architecture, meaning the screw-down crown and reinforced case back protect the movement in everyday situations well beyond the sink or swimming pool. The five-link Jubilee bracelet—one of Rolex's most celebrated designs, introduced alongside the original Datejust in 1945—adds to both the comfort and the heritage narrative of this reference.

For collectors and first-time Rolex buyers alike, the Datejust 31 in this diamond-bezel configuration represents exceptional value in the pre-owned and grey market. Its 31mm footprint suits a wide range of wrist sizes, the black dial colorway is perennially in demand, and the diamond bezel ensures this piece appreciates both in aesthetic and monetary terms over time. It is equally at home paired with evening wear as it is worn through a business day, making it one of the most genuinely versatile luxury watches available.

At Bizak and Co., we specialize in sourcing premium Rolex references including hard-to-find configurations like the 278240BSDBJ. Whether you are looking to buy this Rolex Datejust 31 online or simply want expert guidance on this reference, our team is ready to assist. Please note that Bizak and Co. is not an authorized Rolex dealer; all watches are sold on the secondary market. Reach out to us at bizakandco.com to check current availability and pricing.