Rolex Lady-Datejust 31 31 mm 278343RBRCDO Steel/Yellow Gold/Diamonds Champagne

The Rolex Lady-Datejust is one of the most storied names in watchmaking, and the 31mm case size has long occupied a sweet spot between the classic 28mm ladies' model and the full-size 36mm Datejust. Reference 278343RBRCDO sits within the current Lady-Datejust 31 family and exemplifies the line's dual promise: impeccable mechanical credibility wrapped in jeweler-quality finishing. The Datejust lineage stretches back to 1945, when Rolex introduced the world's first self-winding wristwatch with an automatically changing date display, and every generation since has refined that founding idea rather than reinvented it.

The case of this particular reference is built from a combination of Oystersteel—Rolex's proprietary 904L stainless steel, which takes a deeper polish and resists corrosion more effectively than standard 316L steel—and 18k yellow gold. The warmth of yellow gold appears on the bezel, crown, and bracelet center links, creating the two-tone aesthetic that Rolex calls Rolesor. At 31mm, the Oyster case is sized for a wide range of wrists and feels substantial without overpowering a slender wrist, striking the balance that has made the Lady-Datejust a perennial best-seller across decades.

The bezel of the 278343RBRCDO is one of its most eye-catching elements: a domed profile in 18k yellow gold pavé-set with brilliant-cut diamonds. Unlike the fluted or smooth bezels available on other Datejust variants, the domed diamond bezel gives this reference a decidedly haute-joaillerie character while keeping the overall silhouette clean. The diamonds capture light at every angle, ensuring the watch draws attention on the wrist without sacrificing the restrained elegance that defines the Datejust aesthetic.

The champagne dial complements the yellow gold and diamond package beautifully. Champagne dials have an inherently warm, luminous quality that pairs naturally with yellow gold indices and hands, giving the watch a cohesive, jewelry-forward presentation that reads as intentional rather than ornate. The date aperture at three o'clock—a Datejust signature—remains crisp and legible, framed by the Cyclops lens on the sapphire crystal that magnifies the date 2.5× for effortless reading. The Oyster bracelet in Oystersteel with yellow gold center links echoes the case construction and is secured by a folding Crownclasp, combining security with easy sizing adjustments.

Powering the watch is a Rolex automatic movement, providing the self-winding convenience that busy modern wearers expect. Rolex automatic movements are produced entirely in-house and are certified as chronometers by the COSC, reflecting the brand's commitment to accuracy and reliability. The Oyster case provides 100 meters (330 feet) of water resistance, meaning the watch can accompany its owner through daily life—rain, splashes, and light swimming included—without concern.

Bizak & Co. is a trusted source for luxury pre-owned and new timepieces, and we invite you to explore the Rolex Lady-Datejust 31 ref. 278343RBRCDO in our current inventory. Whether you are a seasoned collector adding a versatile dress watch or a first-time Rolex buyer drawn to the combination of diamonds, yellow gold, and champagne, this reference delivers lasting value and unmistakable presence. Reach out to our team at bizakandco.com with any questions about condition, pricing, or purchasing options—we are here to help you find the right watch with confidence.