Rolex Datejust 31 — Ref. Case Shape: Round. 278384RBR-0001
The Rolex Datejust 31 Ref. 278384RBR-0001 is a magnificent example of refined craftsmanship and timeless luxury. Combining the brilliance of diamonds with the enduring strength of White Rolesor—a fusion of Oystersteel and 18 ct white gold—this timepiece perfectly represents Rolex’s dedication to elegance, precision, and performance. Its captivating black dial with Roman numeral hour markers radiates sophistication, while the sparkling diamond-set bezel adds an unmistakable touch of glamour.
Case & Materials
Measuring 31 mm in diameter, the Oyster case of this Datejust is crafted from the finest materials. The middle case, forged from highly corrosion-resistant Oystersteel, ensures durability and longevity. The 18 ct white gold bezel, lavishly set with round brilliant-cut diamonds, elevates the aesthetic appeal with a dazzling brilliance that catches the light from every angle. The screw-down winding crown fitted with the Twinlock double waterproofness system ensures the watch remains water-resistant up to 100 meters (330 feet).
Dial & Details
The Rolex Datejust 31 Ref. 278384RBR-0001 showcases a black dial with Roman numeral hour markers, creating a timeless and sophisticated aesthetic. The bold contrast between the deep black background and the polished Roman numerals enhances readability while maintaining the collection’s classic appeal. At 3 o’clock sits the signature date display with the Cyclops lens for easy legibility.
Bracelet & Comfort
The Oyster bracelet of the Datejust 31 Ref. 278384RBR-0001 exemplifies robustness and comfort. Constructed from flat three-piece links in Oystersteel, it provides a secure and ergonomic fit on the wrist. The bracelet is completed with a folding Oysterclasp and the Easylink comfort extension link, allowing the wearer to effortlessly adjust the bracelet length by approximately 5 mm—ideal for adapting to changes in wrist size throughout the day.
Movement & Precision
At the heart of this timepiece lies the Rolex Calibre 2236, an in-house self-winding mechanical movement designed for supreme accuracy and reliability. It features a Syloxi silicon hairspring, offering outstanding resistance to temperature variations, shocks, and magnetic fields. With a precision rate of −2/+2 seconds per day and a power reserve of approximately 55 hours, this calibre ensures flawless performance in all conditions. Certified as a Superlative Chronometer, it upholds Rolex’s highest standards of excellence.
Technical Specifications
- Reference: 278384RBR-0001
- Collection: Datejust 31
- Case Material: White Rolesor (Oystersteel and 18 ct white gold)
- Case Diameter: 31 mm
- Bezel: Diamond-set, 18 ct white gold
- Dial: Black with Roman numeral hour markers
- Bracelet: Oyster, flat three-piece links
- Clasp: Folding Oysterclasp with Easylink extension
- Movement: Calibre 2236, self-winding mechanical
- Power Reserve: Approximately 55 hours
- Water Resistance: 100 meters / 330 feet
- Certification: Superlative Chronometer (COSC + Rolex standards)
Key Features 278384rbr-0001
- Diamond-set bezel: Enhances brilliance and luxurious appeal.
- White Rolesor construction: Combines durability with elegance.
- Oyster bracelet: Known for its robustness, comfort, and secure fit.
- Calibre 2236 movement: Equipped with advanced Rolex innovations for exceptional precision.
Conclusion
The Rolex Datejust 31 Ref. 278384RBR-0001 stands as a timeless symbol of sophistication and precision. With its black dial, diamond bezel, and White Rolesor construction, it captures the perfect harmony between elegance and technical mastery. This exquisite timepiece is designed for women who appreciate refinement, resilience, and the everlasting charm of true luxury.

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