Rolex Datejust 31 31 mm 278344RBRAZBFMDJ Steel/White Gold/Diamonds Blue Rolex Datejust 31 31 mm 278344RBRAZBFMDJ Steel/White…

The Rolex Datejust is arguably the most recognizable dress watch ever made, tracing its origins to 1945 when it became the first wristwatch to display the date in a magnified window on the dial—a feature Rolex calls the Cyclops lens. Across more than seven decades, the Datejust has retained that instantly legible date function while continuously evolving in case materials, dial treatments, and bracelet options. The 31mm sizing sits at the heart of Rolex's mid-size Datejust family, offering a versatile case diameter that wears elegantly on a wide range of wrist sizes without sacrificing the bold visual presence that defines the collection.

Reference 278344RBR represents one of the most luxurious interpretations of the Datejust 31. The case and bracelet are crafted from a combination of Oystersteel—Rolex's proprietary 904L stainless steel alloy prized for its exceptional corrosion resistance and mirror-quality polish—and 18k white gold, the latter lending the lugs and crown a bright, cool-toned contrast to the brushed steel flanks. This two-material construction is a hallmark of the Rolesor tradition that Rolex has employed since mid-century, and in white gold it reads as quietly opulent rather than overtly flashy.

The dial of this particular example, designated by the suffix AZBFMDJ in the extended reference, is an azzurro blue floral motif diamond dial—one of the most coveted dial variations in the current Datejust 31 lineup. The soft sky-blue ground provides an ideal canvas for the delicate floral pattern, and the diamond hour markers catch and scatter light in a way that transforms the dial into something closer to jewelry than instrumentation. Crowning the case is an 18k white gold domed bezel set with diamonds, which frames the dial in a continuous arc of brilliance and reinforces the watch's gemstone theme without crossing into ostentation.

The movement powering the Datejust 31 is a Rolex-manufactured automatic caliber, benefiting from the precision engineering and rigorous testing standards that have earned Rolex movements their reputation for reliability and chronometric accuracy. The watch carries a water resistance rating of 100 meters (330 feet), courtesy of the Oyster case architecture—the screw-down Twinlock crown and the solid case back that have protected Rolex movements since 1926. This level of water resistance means the watch is entirely at home worn daily through everything from a light rain to a swim, rare for a heavily jeweled dress piece.

Wearing the Rolex Datejust 31 278344RBRAZBFMDJ on the wrist is an experience that rewards close attention. The Jubilee bracelet—a five-link design created by Rolex specifically for the original Datejust in 1945—drapes with a fluid, almost fabric-like suppleness that distinguishes it from the sportier Oyster bracelet. The 31mm case diameter sits low on the wrist with the elegance appropriate to a diamond-set piece, yet the Oyster case architecture ensures it never feels fragile. The azzurro blue dial shifts beautifully under different lighting conditions, appearing cerulean in bright sunlight and a deeper, more mysterious blue in lower light.

At Bizak & Co., we specialize in bringing discerning collectors access to exceptional Rolex references like the 278344RBRAZBFMDJ that can be difficult to source through conventional channels. Whether you are purchasing your first Rolex or adding a jeweled Datejust 31 to an established collection, our team is available to answer questions, provide additional photographs, and guide you through a secure purchase. Browse our current inventory at bizakandco.com or contact us directly to discuss this reference—opportunities to acquire a Datejust 31 with this exact dial and diamond bezel combination do not last long.