Rolex Lady-Datejust 31 31 mm 278383RBRBMDO Steel/Yellow Gold/Diamonds Black Mother of Pearl

The Rolex Lady-Datejust 31 is one of the most enduring icons in watchmaking, tracing its lineage back to the original Datejust introduced in 1945—the first self-winding wristwatch to display the date in a window at three o'clock. The Lady-Datejust line refined those proportions for a smaller case, and the modern 31mm sizing—reference 278383RBRBMDO—represents Rolex's current interpretation of that legacy: a case that sits elegantly on the wrist yet carries all the engineering sophistication of the full-size Datejust.

The case and bracelet of the 278383RBRBMDO are built in Rolex's proprietary Rolesor combination, pairing corrosion-resistant Oystersteel with 18k yellow gold. Yellow gold appears on the bezel setting, the crown, and the center links of the Oyster bracelet, creating a warm, two-tone contrast against the polished and brushed steel surfaces. The Oyster bracelet itself is a study in functional elegance: its three-piece link construction lies flat against the wrist and terminates in Rolex's Oysterclasp for secure, tool-free adjustment.

The dial is where the 278383RBRBMDO becomes truly extraordinary. Black mother-of-pearl is harvested from the inner lining of mollusk shells, meaning no two dials are ever identical—each shifts between deep midnight black and subtle iridescent blues and greens depending on the light source and viewing angle. Rolex frames this natural gemstone with applied hour markers and hands finished in yellow gold-tone, ensuring legibility even as the dial draws the eye.

Encircling that dial is a diamond-set bezel, in which individual brilliant-cut diamonds are set by Rolex's in-house gem-setting artisans. The factory diamond bezel is a significant distinction from aftermarket diamond work: every stone is selected and set to Rolex's internal quality standards, and the modification is reflected in the reference number itself, preserving the watch's authenticity and collectibility. The automatic movement powering this reference keeps the watch running without manual winding, driven by the natural motion of the wearer's wrist.

Wearing the Lady-Datejust 31 278383RBRBMDO is an experience that transcends category. At 31mm it is versatile enough for daily wear yet refined enough for formal occasions, and the combination of the black mother-of-pearl dial, diamond bezel, and yellow gold Rolesor construction gives it a presence far beyond its modest case diameter. Collectors and enthusiasts who appreciate factory originality will note that the complete reference number—ending in RBRBMDO—encodes the diamond bezel, the black mother-of-pearl dial, and the Oyster bracelet, making provenance immediately traceable.

At Bizak & Co., we specialize in sourcing and presenting exactly this caliber of timepiece for discerning buyers across the United States. Whether you are adding to an established collection or purchasing your first luxury watch, our team provides expert guidance, transparent pricing, and a seamless buying experience. Browse the Rolex Lady-Datejust 31 278383RBRBMDO for sale at bizakandco.com or reach out directly to buy online or inquire about availability—we are here to help you acquire this exceptional piece with confidence.