Rolex Lady-Datejust 31 31 mm 278343RBRWMDO Steel/Yellow Gold/Diamonds White Mother of Pearl

The Rolex Lady-Datejust 31 is one of the most enduring icons in luxury watchmaking, representing decades of refinement within the Datejust family — itself introduced in 1945 as the first self-winding waterproof wristwatch to display the date through a magnifying cyclops lens. The 31mm case size sits at the heart of the Lady-Datejust range, offering a presence that reads as distinctly feminine yet bold enough for contemporary tastes. Reference 278343RBRWMDO is among the most glamorous iterations of this model, combining the workhorse reliability Rolex is famous for with jewellery-level decoration that few watch brands can match.

The case of the 278343RBRWMDO is constructed in a harmonious pairing of Oystersteel — Rolex's proprietary 904L stainless steel alloy prized for its superior corrosion resistance and high-polish finish — and 18k yellow gold. This Rolesor combination, as Rolex calls it, has been a signature of the Datejust line for generations, creating a warm two-tone contrast that photographs beautifully and ages gracefully on the wrist. The 31mm Oyster case is rated to 100 meters (330 feet) of water resistance, housing a screwed-down Twinlock crown and a sapphire crystal with Rolex's signature cyclops date magnifier.

The dial is one of the most captivating aspects of this particular reference. White mother-of-pearl is a natural material harvested from mollusk shells; no two dials are ever precisely alike, which means every 278343RBRWMDO dial is subtly unique — shifting from ivory to pale blue to silver depending on the angle of light. This organic iridescence complements the diamond-set bezel superbly. The domed bezel is fashioned in 18k yellow gold and set with brilliant-cut diamonds, adding a continuous ring of sparkle that elevates the watch from an instrument of time to a true jewellery piece.

Inside the Oyster case beats a Rolex automatic movement, the perpetual self-winding technology that has defined the brand since the 1930s. Rolex movements are manufactured entirely in-house at their Geneva and Biel facilities and are certified by COSC as chronometers before receiving additional in-house testing to Rolex's own more exacting standards. The result is a movement that delivers exceptional long-term accuracy and requires servicing only every ten years under normal use — a compelling practical argument alongside the aesthetic ones.

Wearing the Lady-Datejust 31 ref. 278343RBRWMDO is an experience in effortless luxury. The 31mm diameter sits perfectly on a wide range of wrist sizes, the Oyster bracelet with its three-link design hugging the wrist securely yet comfortably, aided by Rolex's Easylink comfort extension system. Whether paired with evening wear or a business ensemble, the two-tone Rolesor construction and diamond bezel ensure this watch is as versatile as it is eye-catching. For collectors seeking a piece that holds strong secondary-market value, the Lady-Datejust in diamond-bezel Rolesor configuration has demonstrated consistent demand.

At Bizak & Co., we specialize in sourcing and presenting pre-owned and unworn luxury timepieces with the depth of knowledge you expect from a seasoned dealer. The Rolex Lady-Datejust 31 278343RBRWMDO represents exactly the kind of investment-grade, statement watch we love to place with discerning buyers. Browse this reference at bizakandco.com or reach out directly — our team is ready to answer every question and guide you through a confident purchase. Please note that Bizak & Co. is not an authorized Rolex dealer; all Rolex trademarks belong to Rolex SA.