Rolex Datejust 31 31 mm 278240GSO Steel Dark Grey

The Rolex Datejust is one of the most recognized and historically significant watches ever made, having introduced the date complication to the wristwatch world in 1945. Over the decades it has evolved through numerous case sizes and dial configurations while retaining the architectural DNA that made it iconic. The 31 mm variant occupies a refined middle ground in the Datejust family, offering a proportionate presence on a wide range of wrist sizes without sacrificing any of the model's storied heritage.

Reference 278240GSO presents the Datejust 31 in polished and brushed stainless steel, a material Rolex works to exacting tolerances in its own foundry. The 31 mm Oyster case is instantly recognizable, with its middle case, caseback, and winding crown machined from a single block of steel and fitted with Rolex's screw-down Twinlock crown to deliver reliable water resistance to 100 meters (330 feet). The smooth domed bezel sits low over the crystal and gives the dial an almost frameless, jewel-like presentation.

The dark grey dial is one of the most versatile colorways in the Datejust 31 palette. Its cool, neutral tone catches the light differently throughout the day, shifting from a deep charcoal in lower light to a luminous slate in brighter conditions. Index hour markers punctuate the dial with precision, providing excellent legibility while keeping the aesthetic clean and contemporary. This combination of dark grey and steel gives the watch a quietly confident character that works equally well with formal dress and casual attire.

Powering the watch is an automatic movement, a hallmark of Rolex's commitment to mechanical excellence. Rolex manufactures its movements entirely in-house, holding them to chronometric standards that exceed those required for COSC certification. The result is a watch that keeps exceptional time day after day with nothing more than the natural motion of the wearer's wrist to keep it wound and running.

On the wrist, the 31 mm case diameter and the three-link Oyster bracelet deliver a balanced, secure fit. The Oyster bracelet is one of the most copied designs in watchmaking yet remains unmatched in its original form for comfort, durability, and longevity. Its alternating polished and brushed links complement the domed bezel and create a cohesive, sophisticated look from every angle.

Bizak & Co. is a trusted source for pre-owned and gray-market Rolex watches, and this Datejust 31 ref. 278240GSO represents exactly the kind of timeless, high-demand reference that holds its desirability over time. Whether you are adding to a collection or buying your first Rolex, our team is on hand to answer questions, provide additional photographs, and guide you through a confident purchase. Explore this reference on bizakandco.com or reach out directly to secure it today.