The Rolex Datejust 31 reference 278383RBR-0028 is a luxury mid-size timepiece characterized by its 31mm Yellow Rolesor case, which harmoniously combines durable Oystersteel with 18k yellow gold. This model is distinguished by a white mother-of-pearl dial, where each piece is unique due to the natural variations of the shell. The dial is further elevated by ten handset diamonds in 18k gold settings acting as hour markers. A fixed 18k yellow gold bezel set with 46 brilliant-cut diamonds encircles the scratch-resistant sapphire crystal, which features the signature Cyclops lens for date magnification. The watch is paired with a two-tone Jubilee bracelet, a five-piece link design known for its comfort and elegance, secured by a concealed folding Crownclasp.
The watch is powered by the in-house caliber 2236, a perpetual, mechanical self-winding movement that is a COSC-certified Superlative Chronometer. This movement incorporates a Syloxi hairspring in silicon, providing high resistance to magnetic fields and temperature variations, alongside high-performance Paraflex shock absorbers. It offers a power reserve of approximately 55 hours and supports central hour, minute, and seconds hands with an instantaneous date window at 3 o’clock. The Oyster case construction, featuring a screw-down case back and a Twinlock double waterproofness system, ensures a reliable water resistance of 100 meters.
General reviews of the Datejust 31 collection emphasize its versatility and ideal proportions for a wide range of wrist sizes, often serving as a bridge between smaller jewelry pieces and larger sports models. Collectors frequently praise the mother-of-pearl dial for its iridescent depth and the factory diamond setting for its exceptional craftsmanship and light play. While some critics note that two-tone diamond models may not hold their secondary market value as robustly as stainless steel sports references, the 278383RBR is widely regarded as a timeless investment in style and mechanical reliability for daily or formal wear.