Rolex 278240-0002 Datejust 31mm Stainless Steel Jubilee Black Dial Watch

Rolex Datejust 31 – Ref. Case Shape: Round. 278240-0002

The Rolex Datejust 31 Ref. 278240-0002 is an elegant, purely stainless steel edition in Rolex’s Datejust 31 line. Optimized for women who prefer a sleek, all-steel aesthetic without added gold accents, this model features a refined black sunray dial, crisp Roman numeral hour markers, a domed bezel, and the signature jubilee bracelet. Its balanced proportions, robust movement, and classic styling make it a timeless choice for everyday wear.

Case & Bezel

The timepiece houses a 31 mm Oyster case crafted entirely in 904L Oystersteel, known for exceptional resistance to corrosion and enduring finish. Complementing the clean design is a polished domed bezel, which offers subtle elegance and softness without the flare of fluted or gem-set styles. Together, the case and bezel provide a classical yet modern profile, ideal for those who appreciate understatement.

Dial & Hour Markers

The Ref. 278240-0002 is believed to feature a refined black sunray dial with radial brushing that plays with light for subtle depth. Hour positions are marked by applied Roman numerals in polished steel or white gold tones for clarity and contrast. The classic layout is completed by the signature date window at 3 o’clock, topped with Rolex’s Cyclops magnifier for enhanced readability.

Bracelet & Comfort

Completing the timepiece is the sophisticated Jubilee bracelet, a five-piece link design that balances strength and suppleness. Crafted in Oystersteel, its alternating polished and satin finishes enhance its visual texture, while the concealed Crownclasp maintains a seamless aesthetic. The Jubilee bracelet, first introduced in 1945, continues to embody Rolex’s commitment to comfort and style — a perfect match for the Lady-Datejust’s timeless allure.

Movement & Precision

Underneath the dial beats Rolex’s in-house Calibre 2236, a self-winding mechanical movement that features the advanced Syloxi silicon hairspring and robust shock absorption. Certified as a Superlative Chronometer after casing, it provides accuracy to within −2/+2 seconds per day. With a power reserve of around 55 hours, it is built to perform reliably across varied wear schedules.

Specifications at a Glance

• Reference: 278240-0002
• Case Material: Oystersteel (all steel)
• Case Diameter: 31 mm
• Bezel: Polished domed bezel
• Dial: Black sunray with Roman numeral hour markers
• Movement: Calibre 2236, automatic
• Power Reserve: ~55 hours
• Bracelet: Jubilee
• Water Resistance: 100 m / 330 ft
• Certification: Rolex Superlative Chronometer

Why This Model Is Unique

• All-steel design: No gold elements, giving it a sleek, monochromatic elegance.
• Domed bezel: Offers understated sophistication over more ornate bezel styles.
• Roman numeral dial: A classic aesthetic that distinguishes it from index-only variants.
• Calibre 2236 movement: Modern Rolex engineering ensuring precision, durability, and innovation.

Conclusion

The Rolex Datejust 31 Ref. 278240-0002 appeals to those who favor an all-steel, refined design with traditional elements. Its black Roman-dial, domed bezel, and Jubilee bracelet combine to deliver a watch that is both elegant and durable. With Rolex’s hallmark movement and build quality, this Datejust is an enduring companion that bridges classic style with modern reliability.