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

The Rolex Datejust is one of the most storied and instantly recognizable watch families in horological history, first introduced in 1945 as the first self-winding waterproof chronometer wristwatch to display the date in a window on the dial. The Lady 31 designation places this reference in the versatile mid-size tier—sitting between the classical 28mm Lady-Datejust and the full 36mm Datejust—making it a favorite among collectors and everyday wearers alike who prefer a slightly more assertive presence on the wrist without sacrificing femininity or proportion.

The reference 278240BDBO showcases a compelling combination of materials. The case is constructed from Rolex's proprietary Oystersteel, the brand's corrosion-resistant 904L stainless steel alloy, accented by white gold elements that lend the watch a luminous, precious character. The Oyster case measures a precise 31mm in diameter and is water resistant to 100 meters (330 feet), underpinning the watch's credentials as a serious, capable timepiece built to Rolex's exacting standards.

The dial is unquestionably the focal point of the 278240BDBO. A deep, dramatic black surface is set with diamonds that catch the light with every movement of the wrist, transforming a classic Datejust format into something genuinely glamorous. Complementing this, the bezel is fitted with a custom diamond setting that encircles the dial in brilliance, adding a layer of opulence that elevates the reference beyond the standard Datejust lineup. Paired with the iconic three-link Oyster bracelet in Oystersteel, the watch achieves a perfect harmony of boldness and polish.

Powering the 278240BDBO is an automatic movement, ensuring the watch winds itself through the natural motion of the wearer's wrist and delivers the reliable, precise timekeeping that Rolex is globally respected for. The Datejust line has always been defined by its self-winding mechanical heart, a technology Rolex pioneered and has continuously refined over decades. Owners can expect the consistency and dependability that have made the Datejust a generational heirloom.

On the wrist, the 31mm case strikes an ideal balance—substantial enough to read beautifully and command attention, refined enough to wear with delicate jewelry or formal attire. The black diamond dial draws the eye with quiet confidence, and the sparkling bezel adds a festive, celebratory quality that makes this reference equally at home at a gala or a business lunch. It is a watch for the woman who understands that true luxury is both seen and felt.

Bizak & Co. is proud to offer the Rolex Datejust Lady 31 ref. 278240BDBO to discerning buyers across the United States. Please note that Bizak & Co. is not an authorized Rolex dealer; all watches are offered on the pre-owned or gray market. Whether you are looking to buy this Rolex Datejust online or prefer a personal consultation, our team is here to guide you through every step of the process. Reach out to Bizak & Co. at bizakandco.com to learn more, ask questions, or secure this stunning timepiece for your collection.