Rolex Lady-Datejust 31 31 mm 278343RBRBMDJ Steel/Yellow Gold/Diamonds Black Mother of Pearl

The Rolex Lady-Datejust is one of the most enduring icons in watchmaking, having defined the concept of the elegant automatic dress watch for women since the Datejust family's mid-twentieth-century origins. Across decades the line has evolved in case size, material combinations, and dial artistry, yet it has never abandoned the core principles that made it great: Swiss automatic movement, precious-metal construction, and a date complication displayed with effortless legibility. The 31mm Lady-Datejust occupies the sweet spot between the petite 28mm and the full-size 36mm, offering a balanced wrist presence that suits a wide range of wearers.

Reference 278343RBRBMDJ represents one of the most glamorous expressions of the Lady-Datejust 31 lineup. The case and Jubilee bracelet are rendered in Rolex's signature Oystersteel—a highly corrosion-resistant steel alloy—complemented by 18k yellow gold crown guards, midlinks, and, most prominently, the beautifully domed bezel. That bezel is set with brilliant-cut diamonds, catching light at every angle and framing the dial in a continuous arc of sparkle that elevates the watch from refined to genuinely striking.

The dial is crafted from black mother-of-pearl, a material harvested from the inner shell of mollusks and prized for its organic, shifting iridescence. Against the warm gold of the bezel and bracelet center links, the deep, almost midnight quality of the black MOP creates a contrast that is simultaneously bold and sophisticated. No two mother-of-pearl dials are identical, meaning every 278343RBRBMDJ carries a subtly unique character that mass-produced dials cannot replicate.

Power comes from a Rolex automatic movement, ensuring reliable self-winding performance driven by everyday wrist motion. Rolex's in-house movements are celebrated for their precision, durability, and COSC-standard chronometric performance, and the Lady-Datejust line benefits from the same rigorous manufacture standards applied across the entire Rolex catalog. The watch is also water resistant to 100 meters (330 feet), making it far more capable than its dressy aesthetic might suggest and genuinely suitable for daily wear, light swimming, and travel.

The five-piece Jubilee bracelet—a design Rolex introduced specifically for the Datejust in 1945—completes the watch with a supple, jewel-like feel on the wrist. Its alternating polished center links and brushed outer links echo the two-tone theme of the case, and the fine-pitch construction drapes naturally, ensuring comfortable all-day wearability. Together, every element of reference 278343RBRBMDJ tells a coherent aesthetic story: maximum femininity, serious horology, and no compromise on durability.

At Bizak & Co., we specialize in sourcing and presenting luxury timepieces at the standard discerning collectors and gift-givers expect. If you are searching to buy the Rolex Lady-Datejust 31 278343RBRBMDJ online or simply want to learn more about current availability and pricing, reach out to our team directly. We are happy to provide detailed condition notes, additional photographs, and any other information you need to make a confident purchase. Please note that Bizak & Co. is not an authorized Rolex dealer.