Diamond Source NYC: The Rolex Datejust 31 – Reference 278240
Pre-Owned & New | NYC Diamond District ★★★★★ (448 Google Reviews)
Questions? Call (212) 730-5959 or visit us at 20 W 47th St, Suite 401, New York, NY
The Rolex Datejust 31, specifically Reference 278240, is widely considered the “sweet spot” of the Datejust collection. Offering a larger presence than the traditional 28mm Lady-Datejust but maintaining a more slender profile than the 36mm version, the 278240 is defined by its full Oystersteel construction and polished smooth bezel. At Diamond Source NYC, we showcase this reference as the premier choice for a versatile, everyday luxury timepiece that transitions seamlessly from casual to formal settings.
The 31mm Oystersteel Case
Reference 278240 is crafted entirely from Rolex's proprietary Oystersteel. Part of the 904L steel family, this alloy is exceptionally resistant to corrosion and maintains a high-polish luster that rivals precious metals. The 31mm case size provides enough dial real estate for high legibility while remaining lightweight and comfortable for all-day wear. The monobloc middle case and screw-down Twinlock winding crown ensure a waterproof rating of up to 100 meters (330 feet).
Understated Elegance: The Smooth Bezel
Unlike its fluted counterparts, the 278240 features a domed, smooth-polished bezel. This design element gives the watch a more contemporary and streamlined appearance. It is often the preferred choice for collectors who appreciate the Rolex heritage but desire a more understated look that does not draw excessive attention. The smooth bezel also highlights the craftsmanship of the hand-polished steel surfaces.
Calibre 2236: Precision and Performance
Inside the Datejust 278240 is the Calibre 2236, a self-winding mechanical movement entirely developed and manufactured by Rolex. This movement features the patented Syloxi hairspring in silicon, which is insensitive to magnetic fields and remains extremely stable in the face of temperature variations. It offers a power reserve of approximately 55 hours and carries the Superlative Chronometer certification, guaranteeing a precision of -2/+2 seconds per day.
Dial Options and the Oyster Bracelet
The 278240 serves as a versatile canvas for a variety of dial colors, including the classic Silver sunray, the vibrant Mint Green, and the deep Bright Blue. Many models in our inventory feature the iconic Oyster bracelet, characterized by its flat three-piece links and the folding Oysterclasp with the Easylink 5mm comfort extension link. For a more formal aesthetic, the reference is also available on the five-piece Jubilee bracelet, providing two distinct personalities for the same reference number.
Why Purchase Reference 278240 from Diamond Source NYC
Located in the heart of Manhattan, Diamond Source NYC provides a secure and professional environment for acquiring high-demand Rolex references. Each 278240 in our collection undergoes a rigorous multi-point inspection to ensure authenticity and mechanical integrity. Whether you are a first-time buyer or a seasoned collector, our experts are available to guide you through the specific nuances of the 31mm Datejust collection.