Rolex Lady-Datejust 31 31 mm 278381RBRROSJ Steel/Rose Gold/Diamonds Rose

Few watches have defined elegant timekeeping for women as completely as the Rolex Lady-Datejust. Introduced as the first self-winding, waterproof wristwatch with a date complication scaled for a woman's wrist, the Lady-Datejust has been refined across decades into one of the most recognizable luxury watch silhouettes in the world. The 31 mm case size represents the midsize expression of this lineage, offering a slightly more substantial wrist presence than the classic 28 mm while remaining entirely feminine in its proportions.

Reference 278381RBRROSJ exemplifies the Lady-Datejust 31 at its most opulent. The 31 mm Oyster case pairs Oystersteel — Rolex's proprietary corrosion-resistant alloy from the 904L steel family — with 18k Everose gold, the brand's exclusive rose-gold alloy engineered to resist fading over time. The result is a two-tone composition that feels at once sporty and luxurious, a balance Rolex has mastered across its Professional and Dress collections alike.

The rose dial is the visual heart of this reference. Warm and richly hued, it pairs naturally with the Everose gold accents throughout the case and bracelet, creating a chromatic harmony that is impossible to ignore. Hour markers set in luminescent material ensure legibility even in low light, while the iconic Cyclops lens over the date aperture at 3 o'clock magnifies the date 2.5× for instant readability — a detail that has been a Rolex hallmark for generations.

Encircling the dial is a fully diamond-set bezel, one of the most coveted configurations in the Lady-Datejust catalogue. Each diamond is individually selected and set by Rolex craftspeople to meet exacting standards of cut, clarity, color, and carat weight, transforming the functional bezel into a continuous band of brilliance. The five-piece link Jubilee bracelet — developed by Rolex specifically for the Datejust — completes the ensemble with supple, jewelry-grade elegance and a secure Crownclasp hidden within the folding clasp for a clean, uninterrupted profile on the wrist.

Powering reference 278381RBRROSJ is a Rolex automatic movement, self-winding via a perpetual rotor and offering the reliability and precision that have earned Rolex its reputation as an industry benchmark. The watch carries a water resistance of 100 meters (330 feet), meaning it withstands everyday exposure to water, splashes, and swimming with ease — a meaningful practical advantage for a watch worn daily.

At Bizak & Co., we source pre-owned and unworn luxury timepieces with care and present them with full transparency. The Lady-Datejust 31 in reference 278381RBRROSJ is one of the most sought-after configurations in the current market, combining diamond jewelry and robust Rolex engineering in a package that holds value exceptionally well. Whether you are buying your first Rolex or adding a cornerstone piece to an established collection, we invite you to contact Bizak & Co. to discuss this reference, confirm current availability, and buy online or in person with confidence.