Rolex Datejust 31 31 mm 278240GNSO Steel Green

The Rolex Datejust is one of the most enduring and recognizable watch designs in horological history. Introduced in 1945 as the first self-winding wristwatch to display the date in a window at 3 o'clock, the Datejust has been refined across decades while retaining its signature proportions, balanced aesthetics, and uncompromising quality. The 31mm configuration occupies a versatile middle ground — larger than a classic ladies' dress watch yet refined enough to wear with anything from a boardroom suit to a weekend ensemble — making it a perennial favorite for a wide range of wearers.

Reference 278240GNSO exemplifies the modern Datejust 31 at its most vivid. The green dial is the defining feature here: rich, deep, and luminous under natural light, green has become a symbol of contemporary Rolex identity and commands significant collector and buyer attention. Paired with the stainless steel domed bezel — a nod to the earliest Datejust references — the dial color creates a sophisticated contrast that feels both fresh and classically grounded. The result is a watch that photographs beautifully and wears even better.

The case and bracelet are crafted from Rolex's proprietary Oystersteel, a 904L stainless steel alloy chosen for its exceptional corrosion resistance and ability to take and hold a high polish far longer than standard 316L steel. The Oyster bracelet, one of the most copied but never equaled bracelet designs in watchmaking, features Rolex's Easylink comfort extension system allowing a fine adjustment of up to 5mm in bracelet length — a practical touch that makes the watch genuinely comfortable across temperature and activity changes.

Inside the case, an automatic movement drives the watch with the smooth, self-winding reliability that Rolex movements are world-renowned for. The Oyster case construction provides water resistance to 100 meters (330 feet), secured by the screw-down Triplock winding crown that is a hallmark of Rolex Oyster engineering. This means the 278240GNSO is fully capable of accompanying its wearer through daily life — from hand-washing and rain exposure to light aquatic activity — without concern.

At Bizak & Co., we offer this Rolex Datejust 31 ref. 278240GNSO as a certified authentic, brand-new timepiece. Every watch we sell undergoes rigorous authenticity verification, and our team of specialists is available to answer questions, provide additional images, and guide you through a transparent and secure purchase. Whether you are buying your first Rolex or adding a coveted green-dial reference to an established collection, the 278240GNSO available at bizakandco.com represents an exceptional opportunity to acquire a modern classic. Reach out to Bizak & Co. today and let us help you secure this piece.