The Rolex Datejust 31 reference 278384RBR-0010 is a prestigious mid-size timepiece that blends durable construction with high-end jewelry elements. The 31mm case is crafted from White Rolesor, a signature Rolex combination of 904L Oystersteel and 18k white gold. Its aesthetic is defined by a sunray-finished dark grey dial adorned with ten diamonds set in 18k gold settings and a fixed bezel meticulously set with brilliant-cut diamonds. The watch is paired with a stainless steel Jubilee bracelet featuring five-piece links and a concealed folding Crownclasp, providing a seamless and comfortable fit on the wrist.
Under the dial, the watch is powered by the manufacture caliber 2236, a self-winding mechanical movement that features a silicon Syloxi hairspring and Paraflex shock absorbers for enhanced resistance to temperature fluctuations and physical impacts. This movement is a COSC-certified Superlative Chronometer, offering a precision of -2/+2 seconds per day and a power reserve of approximately 55 hours. In terms of complications, the timepiece provides central hours, minutes, and seconds, along with an instantaneous date window at the 3 o’clock position magnified by a Cyclops lens. Its Oyster architecture, featuring a screw-down Twinlock crown, ensures a water resistance of up to 100 meters.
General reviews of this reference emphasize its versatility as both a formal accessory and a daily luxury watch. Owners frequently praise the depth of the dark grey sunray dial, noting how its appearance shifts from rich black to subtle charcoal depending on lighting conditions. The 31mm size is widely regarded as a classic proportion for those seeking a feminine but present silhouette. While the diamond-set bezel and markers are lauded for their exceptional brilliance and craftsmanship, some collectors note that the absence of double anti-reflective coating on the sapphire crystal can occasionally affect legibility in direct sunlight. Overall, it is highly rated for its mechanical reliability and the refined integration of precious stones into a robust tool-watch frame.