The Rolex Datejust 31 reference 278240-0005 is a mid-size luxury timepiece featuring a 31mm case crafted from Oystersteel, a high-performance 904L alloy known for its exceptional corrosion resistance and polish. This model is characterized by its minimalist and contemporary aesthetic, utilizing a smooth polished bezel rather than the traditional fluted design. The silver dial features a sunray finish that creates subtle light reflections, complemented by highly legible Chromalight baton hour markers and hands with long-lasting blue luminescence. The watch is paired with a sporty three-piece link Oyster bracelet, which includes a folding Oysterclasp and the Easylink comfort extension system for quick 5mm adjustments.
Powered by the in-house Calibre 2236, this self-winding mechanical movement is a Superlative Chronometer certified for precision within -2/+2 seconds per day. It incorporates a patented Syloxi silicon hairspring that provides high resistance to magnetic fields and temperature variations, alongside high-performance Paraflex shock absorbers. The movement offers a power reserve of approximately 55 hours. In terms of complications, the timepiece features central hours, minutes, and seconds, with an instantaneous date display at the 3 o’clock position magnified by a Cyclops lens. Its Oyster case, equipped with a Twinlock double waterproofness system and a screw-down crown, ensures water resistance up to 100 meters.
General reviews of the reference 278240 often highlight its versatility as an everyday luxury watch that balances elegance with a robust build. The 31mm size is frequently praised for offering a modern presence that fits a wide variety of wrist sizes, positioned effectively between the smaller Lady-Datejust and larger classic models. Critics and enthusiasts alike appreciate the clean, monochromatic look of the silver dial and steel construction, noting it as a practical yet sophisticated choice. While the smooth bezel is sometimes viewed as more prone to showing fine scratches compared to a fluted bezel, it is widely favored by those seeking a more understated and streamlined Rolex aesthetic.