The Rolex Datejust 31 reference 278381RBR-0015 is a contemporary luxury watch featuring a 31mm case constructed from Everose Rolesor, a signature combination of Oystersteel and 18k Everose gold. This model is distinguished by a sunray-finished silver dial set with 10 diamonds in 18k gold settings and a fixed Everose gold bezel set with 46 brilliant-cut diamonds. The timepiece is paired with a three-piece link Oyster bracelet that combines polished Everose gold center links with brushed Oystersteel outer links, secured by a folding Oysterclasp with a 5mm Easylink comfort extension.
Internally, the watch is powered by the self-winding caliber 2236, a manufacture Rolex mechanical movement featuring a Syloxi hairspring in silicon for increased resistance to magnetism and temperature variations. This COSC-certified movement provides a power reserve of approximately 55 hours and maintains a precision of -2/+2 seconds per day. The functional layout remains classic, featuring central hours, minutes, and seconds, alongside an instantaneous date window at the 3 o’clock position magnified by a Cyclops lens. Its Oyster case, equipped with a Twinlock double waterproofness system and a scratch-resistant sapphire crystal, ensures water resistance up to 100 meters.
General reviews of the Datejust 31 highlight its versatile size, which offers a balanced wrist presence between the traditional Lady-Datejust and larger professional models. Critics and enthusiasts often praise the high-performance caliber 2236 and the reliability of the Rolesor construction for daily wear. While the diamond-set bezel and dial enhance its aesthetic appeal as a piece of jewelry, some collectors note that the 31mm diameter may feel compact on larger wrists, though it remains a popular and highly sought-after choice for women seeking a blend of horological precision and refined design.