Rolex Datejust Lady 31 31 mm 278240SMOPJ Steel/White Gold/Diamonds Silver

The Rolex Datejust is one of the most recognisable and enduring watch designs in horological history, introduced in 1945 as the first self-winding wristwatch to display the date in a window on the dial. Over nearly eight decades the Datejust has evolved in case size, materials, and decoration while preserving its essential character: clean, balanced proportions that look equally at home in a professional setting or at a formal evening event. The Lady 31, occupying the mid-size position in the current Datejust lineup at 31mm, bridges the gap between the classic 28mm Ladies and the full-size 36mm, offering a versatile wrist presence that suits a broad range of wearers.

Reference 278240SMOPJ exemplifies the most jewel-forward expression of the Datejust 31 platform. The case and bracelet are rendered in Rolex's proprietary Oystersteel — a 904L stainless steel alloy prized for its exceptional corrosion resistance and high-polish finish — complemented by 18k white gold accents that lend the watch its cool, icy luminosity. The result is a case that photographs brilliantly under light and maintains its mirror-like surfaces through years of wear.

The bezel on the 278240SMOPJ is set with diamonds, creating an unbroken halo of brilliance around the dial that elevates the piece from a sports-dress watch to a genuine jewellery timepiece. The silver dial provides a refined, light-reflective backdrop that contrasts beautifully with the sparkling stones, and the overall palette — cool steel, white gold, and clear diamonds against silver — gives the watch a timeless monochromatic sophistication that never risks looking dated.

At the heart of the watch sits Rolex's automatic movement, delivering the reliable self-winding performance that Rolex owners expect. The Oyster case construction, combined with a water resistance rating of 100 metres (330 feet), means the 278240SMOPJ is not merely a display piece; it is a fully capable daily wearer built to Rolex's exacting standards for robustness and precision. The screw-down Oyster crown and case back seal the movement against dust, moisture, and pressure in everyday conditions.

The Jubilee bracelet — originally introduced alongside the very first Datejust in 1945 and considered by many collectors to be the quintessential Datejust bracelet — adds another layer of historical resonance and tactile pleasure to this reference. Its five-piece-link construction drapes softly over the wrist and catches light along every polished centre link, harmonising with the diamond bezel and the gleam of the white gold elements. Wearing the 278240SMOPJ is as much a sensory experience as a sartorial statement.

At Bizak & Co. we specialise in sourcing and presenting pre-owned and grey-market luxury timepieces of this calibre, and the Rolex Datejust 31 ref. 278240SMOPJ represents exactly the kind of versatile, investment-grade watch we are proud to offer. Whether you are a seasoned Rolex collector looking to add a diamond-set mid-size to your rotation or a first-time luxury buyer seeking a watch that will only appreciate in desirability, this reference deserves your attention. Reach out to our team at bizakandco.com to ask about availability, condition details, and pricing — we are here to make your acquisition seamless and confident.