Rolex Lady-Datejust 31 31 mm 278243BMDJ Steel/Yellow Gold Black Mother of Pearl

The Rolex Lady-Datejust is one of the most storied watches in horological history, representing the first self-winding waterproof wristwatch created specifically for women when it debuted in 1957. Across decades of refinement, it has remained the definitive standard for feminine dress watches, combining technical excellence with timeless elegance. The 31mm case size sits at the heart of the Lady-Datejust lineup, offering a presence that is unmistakably refined without being understated — and the reference 278243BMDJ represents this lineage at its most luxurious.

The case and bracelet of the 278243BMDJ are constructed in a harmonious blend of Oystersteel and yellow gold, a combination Rolex refers to as Rolesor. Oystersteel is Rolex's proprietary alloy drawn from the 904L family of stainless steels, prized for its exceptional corrosion resistance, lustrous finish, and ability to hold a polish far longer than conventional steel. The infusion of yellow gold elements — most visibly on the bezel and bracelet center links — introduces warmth and a jewelry sensibility that sets this reference apart from its all-steel siblings.

The dial is the soul of this watch: a black mother of pearl surface that shifts and shimmers under changing light, producing iridescent blues, greens, and purples within its deep base tone. Mother of pearl dials are harvested from the inner lining of mollusk shells and cut into wafer-thin panels, making each one naturally unique. The black variant chosen for the 278243BMDJ is particularly dramatic, creating a compelling contrast against the yellow gold domed bezel that crowns the case — a classic Rolex profile that references the very earliest Datejust designs.

Completing the aesthetic is the five-piece link Jubilee bracelet, a bracelet Rolex introduced alongside the original Datejust in 1945 and one that remains synonymous with the model to this day. Its intricate link construction drapes elegantly around the wrist and offers both comfort and security via the Rolex Crownadjust system integrated into the clasp, allowing micro-adjustment of bracelet length without tools. The watch is also rated to 100 meters (330 feet) of water resistance, meaning it transitions effortlessly from formal occasions to everyday activity. Powering the 278243BMDJ is a certified Rolex automatic movement, ensuring the hallmark precision and reliability the brand is globally renowned for.

Buying a brand-new Rolex Lady-Datejust 31 in reference 278243BMDJ from Bizak & Co. means acquiring a certified authentic timepiece backed by our rigorous authentication standards and our commitment to client satisfaction. Whether you are purchasing this watch as a personal milestone gift, an anniversary treasure, or a long-term investment in wearable luxury, the 278243BMDJ checks every box: iconic design heritage, precious materials, and a movement trusted by millions worldwide. Reach out to Bizak & Co. to inquire, and our team will guide you through every step of the purchase process.