Rolex Lady-Datejust 31 31 mm 278343RBRWMDJ Steel/Yellow Gold/Diamonds White Mother of Pearl Rolex Lady-Datejust 31 31 mm 278343RBRWMDJ Steel/Yellow…

The Rolex Lady-Datejust has been the definitive dressy sport watch for women since Rolex introduced the Datejust family in 1945 — making it the world's first self-winding waterproof wristwatch to display the date in a window on the dial. The 31mm case size sits precisely between the 28mm and the full 36mm Datejust, offering a versatile mid-size proportion that wears beautifully on a wide range of wrists. Over decades the Lady-Datejust has become synonymous with refined femininity grounded in genuine Swiss watchmaking substance, and the 278343RBRWMDJ represents that tradition at its most opulent.

The 31mm Oyster case of reference 278343RBRWMDJ is crafted in Rolesor — Rolex's proprietary pairing of Oystersteel and 18k yellow gold. Oystersteel belongs to the 904L steel family, an alloy prized in aerospace and chemical engineering for its exceptional resistance to corrosion and its ability to take and hold a mirror polish. The warm yellow gold elements — crown, lugs, and the show-stopping domed bezel — complement the cool steel flanks to create a two-tone aesthetic that is simultaneously sporty and luxurious.

The dial is a white mother-of-pearl, a natural organic material whose iridescent surface shifts through soft tones of ivory, blush, and silver depending on ambient light. No two mother-of-pearl dials are identical, giving each watch a one-of-a-kind character. Set against this shimmering canvas, the applied yellow gold hour markers and hands create a warm, cohesive palette, while the date aperture at 3 o'clock — framed by the iconic Cyclops lens on the crystal — keeps the watch firmly in functional Rolex territory.

The yellow gold domed bezel is set with diamonds, elevating reference 278343RBRWMDJ squarely into high-jewellery territory without sacrificing the robust, tool-watch DNA that defines every Rolex. The five-piece Jubilee bracelet — introduced alongside the original Datejust in 1945 and considered one of the most elegant bracelets ever designed — drapes across the wrist with exceptional suppleness. Together, the diamond bezel, mother-of-pearl dial, and Jubilee bracelet create a layered luxury that rewards close inspection. The Oyster case carries a water resistance rating of 100 metres (330 feet), a reminder that this is a fully functional Rolex first and a jewel second.

Powering the Lady-Datejust 31 is a Rolex automatic movement, a perpetual self-winding calibre that winds continuously through the natural motion of the wearer's wrist. Rolex manufactures its movements entirely in-house to chronometer precision standards certified by the COSC, meaning each movement must perform within −4/+6 seconds per day — a benchmark that the vast majority of Swiss watchmakers cannot meet. The result is a watch that is as reliable and accurate as it is beautiful.

At Bizak & Co., we curate pre-owned and unworn luxury timepieces with an emphasis on authenticity, condition, and value. The Rolex Lady-Datejust 31 ref. 278343RBRWMDJ is among the most covetable references in our collection — equally at home on a boardroom wrist, at a formal dinner, or as a milestone gift. Please note that Bizak & Co. is not an authorized Rolex dealer. Contact our team today to inquire about this reference, request additional photographs, or discuss purchase options.