Rolex Lady-Datejust 31 31 mm 278343RBRSRDVIJ Steel/Yellow Gold/Diamonds Silver

The Rolex Lady-Datejust is one of the most enduring icons in watchmaking history, first introduced in 1957 as the feminine counterpart to the legendary Datejust — itself the world's first self-winding wristwatch to feature an automatically changing date. Refined and elevated over decades, the Lady-Datejust 31 occupies a sweet spot in the current collection: large enough to make a confident statement on the wrist, yet precisely proportioned for a feminine silhouette. Reference 278343RBRSRDVIJ represents the line at its most glamorous, pairing precious materials and diamond artistry with the robustness and reliability that define every Rolex.

The 31mm Oyster case of ref. 278343RBRSRDVIJ is constructed in Rolex's proprietary Oystersteel — a 904L stainless steel alloy celebrated for its exceptional corrosion resistance and mirror-bright polish — complemented by warm 18k yellow gold on the bezel, crown, and bracelet center links. This two-tone Rolesor combination has been a hallmark of the Datejust family for generations, simultaneously conveying sportiness and luxury. The domed bezel is set with brilliant-cut diamonds, each individually selected for cut and brilliance, turning the watch's profile into a continuous arc of light that catches the eye from every angle.

The silver dial carries Roman numerals, a classic index choice that lends the piece an almost dress-watch formality while remaining effortlessly legible. Roman numerals on a Lady-Datejust have long signaled a preference for heritage and tradition, and paired with the silver finish they create a dial composition that is clean, luminous, and immediately recognizable as a Rolex. The date aperture at 3 o'clock features Rolex's signature Cyclops lens on the crystal, magnifying the date 2.5× for easy reading — a functional detail as practical as it is iconic.

Powering ref. 278343RBRSRDVIJ is a Rolex automatic movement, the product of the brand's wholly in-house manufacturing philosophy. Rolex designs, develops, and produces every component of its movements in-house, ensuring a level of precision and consistency that earns each caliber a COSC chronometer certification and, in many current references, Rolex's own even more stringent Superlative Chronometer standard. The result is a movement that runs with exceptional accuracy day after day, requiring only the natural motion of the wrist to stay wound. The watch is also water resistant to 100 meters (330 feet), courtesy of the screw-down Twinlock crown and scratch-resistant sapphire crystal — a level of robustness genuinely uncommon in diamond-set dress watches.

On the wrist, the Lady-Datejust 31 in ref. 278343RBRSRDVIJ delivers a presence that transcends the sum of its specifications. The five-piece-link Jubilee bracelet — originally introduced alongside the Datejust in 1945 — drapes elegantly over the wrist with a flexibility and comfort that feel almost textile-like, while its alternating polished and brushed links mirror the two-tone aesthetic of the case. Whether worn to a boardroom meeting, a black-tie event, or an upscale weekend brunch, this watch adapts flawlessly to context. It is equally suited as a first serious luxury watch and as the jewel of an existing collection.

At Bizak & Co., we specialize in sourcing and presenting exceptional pre-owned and unworn Rolex timepieces with the seriousness and transparency that discerning buyers deserve. Reference 278343RBRSRDVIJ is a highly coveted configuration that combines three of the most desirable elements in the Lady-Datejust lineup — diamond bezel, two-tone Rolesor construction, and Roman numeral dial — making it both a joy to wear and a sound long-term acquisition. We invite you to explore this reference in detail on our site at bizakandco.com, or to contact our team directly for provenance details, condition notes, and purchasing assistance. Please note that Bizak & Co. is not an authorized Rolex dealer.