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

The Rolex Datejust is one of the most recognizable and enduring watch designs in horological history, having defined the archetype of the classic date-displaying dress watch since its introduction in the mid-twentieth century. The Lady 31 sizing — at 31mm — occupies the sweet spot between the traditional ladies' 28mm and the full-size 36mm, making it a versatile midsize choice that suits a wide range of wrists and styling preferences. Reference 278240 represents a contemporary expression of this storied lineage, blending Rolex's hallmark engineering with a distinctly luxurious aesthetic.

The case of the 278240 is constructed in Rolex's signature Oystersteel — a 904L stainless steel alloy celebrated for its exceptional corrosion resistance and mirror-polish retention — complemented by 18k white gold accents that lend the piece a cool, refined luminosity. The Oyster case architecture, with its patented screw-down crown and monobloc middle case, delivers robust protection and a water resistance of 100 meters (330 feet), ensuring the watch is equally at home poolside as it is at a formal dinner.

The white dial is a study in understated elegance, providing a clean, bright canvas that maximizes legibility and highlights the Datejust's iconic date window at three o'clock. Diamond indices — carefully set to Rolex's exacting standards — catch the light with every movement of the wrist, adding a layer of brilliance that elevates the dial beyond a simple timekeeping surface into something closer to wearable jewelry.

The custom diamond-set bezel frames the dial with a continuous ring of scintillating stones, amplifying the watch's presence and making it immediately recognizable as a piece of exceptional luxury. This diamond bezel treatment is among the most requested configurations in the Datejust Lady 31 family, attracting buyers who want the trusted Rolex pedigree paired with the visual drama of fine diamond setting. The Oyster bracelet — with its flat three-piece link construction and Crownadjust extension system — ensures a secure, comfortable fit that complements the watch's refined character.

Powering the 278240 is Rolex's self-winding automatic movement, a perpetual-rotor caliber renowned throughout the industry for its precision, reliability, and long service intervals. Rolex movements are COSC-certified chronometers and then further regulated in-house to Rolex's own Superlative Chronometer standard, guaranteeing accuracy to within plus or minus two seconds per day — performance that underpins every Datejust regardless of its decorative appointments.

At Bizak & Co., we specialize in sourcing and presenting exceptional pre-owned and secondary-market Rolex timepieces, and the Datejust Lady 31 reference 278240 is a prime example of why this model commands enduring demand. Whether you are a collector adding a versatile diamond Datejust to your rotation or a first-time luxury watch buyer seeking a piece that will be treasured for decades, we invite you to reach out to our team at bizakandco.com. We are happy to answer questions, provide additional photographs, and guide you through a confident purchase.