Rolex Datejust Lady 31 31 mm 278240MOPDBO Steel/White Gold/Diamonds White Mother of Pearl Rolex Datejust Lady 31 31 mm 278240MOPDBO…

The Rolex Datejust is one of the most storied watch models in horological history, introduced in 1945 as the first self-winding wristwatch to display the date in a window on the dial. Over the decades it has evolved into multiple sizes and configurations, and the 31 mm Datejust occupies an elegant midsize position that suits a wide range of wrists. The Lady 31 designation reflects Rolex's commitment to creating timepieces that are fully featured and robustly constructed, not merely scaled-down versions of larger references. Reference 278240MOPDBO represents the model at its most glamorous, combining two precious materials and a gem-set bezel into a cohesive and wearable luxury statement.

The case of the 278240MOPDBO measures 31 mm in diameter and is crafted from a combination of Oystersteel—Rolex's proprietary 904L stainless steel alloy prized for its exceptional corrosion resistance and high-polish luster—and 18k white gold accents. The Oyster case architecture is one of the most recognizable in watchmaking, defined by its smooth, flowing lugs and the screwed-down Twinlock crown that contributes to water resistance of 100 meters (330 feet). The overall construction reflects the same standards applied across the entire professional Rolex lineup, making this a watch built to last generations.

The dial is the true showpiece of this reference. The white mother-of-pearl surface is a natural material whose organic, shifting iridescence changes character depending on the light source and viewing angle, giving the watch an almost living quality. Diamond indices or accents on the dial add brilliance and reinforce the jewelry-watch character of the piece. The custom diamond-set bezel frames the dial with additional sparkle, completing a look that blends fine jewelry sensibility with the precision instrument DNA that defines every Rolex.

Powering the watch is an automatic movement, meaning the rotor winds the mainspring through the natural motion of the wearer's wrist, offering practical convenience alongside mechanical integrity. Rolex movements are manufactured entirely in-house and are known for their accuracy, reliability, and longevity. The movement inside a Datejust is chronometer-certified by the Contrôle Officiel Suisse des Chronomètres (COSC) and further tested by Rolex's own Superlative Chronometer standards, ensuring precision that meets the demands of everyday life.

On the wrist, the 31 mm Oyster case occupies a refined, confident space that reads as luxurious without being ostentatious. The Oyster bracelet—featuring flat, polished three-piece links—provides a secure, comfortable fit and integrates seamlessly with the case design. Its Oysterclasp buckle includes a safety mechanism for added security. Whether worn to a formal occasion or as an elevated everyday companion, the Datejust Lady 31 in this diamond and mother-of-pearl configuration delivers versatility that few watches can match at any price point.

At Bizak and Co., we specialize in helping discerning collectors and first-time buyers find exceptional Rolex timepieces with confidence. The Rolex Datejust 31 reference 278240MOPDBO for sale here represents a compelling opportunity to own a genuinely iconic watch with one of the most desirable dial and bezel combinations available. Please note that Bizak and Co. is not an authorized Rolex dealer. We encourage you to reach out to our team with any questions about this reference—we are here to guide you through every detail and ensure a purchase experience that matches the quality of the watch itself.