Rolex Datejust 278274-0016 31mm

The Rolex Datejust 31 m278274-0016 Dark Grey Sunray Dial is a sophisticated masterpiece of understated elegance and modern versatility. Renowned for its refined proportions and timeless appeal, this 31mm model upholds the Datejust’s iconic legacy since 1945, blending classic design with contemporary depth. With its captivating dark grey sunray dial featuring highly legible Chromalight luminescence and the harmonious White Rolesor combination of Oystersteel and white gold, the Datejust offers subtle luxury with a bold, luminous presence.

Design and Craftsmanship

This Datejust boasts a 31mm Oystersteel case complemented by a fluted white gold bezel, creating the signature White Rolesor interplay of durability and opulence. The dark grey dial achieves its sunray finish through expert brushing techniques, with radiating grooves that produce subtle, shifting light reflections for dynamic depth and brilliance. Applied via Physical Vapour Deposition or electroplating and sealed with varnish, it ensures lasting intensity, enhanced by Chromalight hour markers and hands for a long-lasting blue glow. The date at 3 o’clock is magnified by the Cyclops lens, while scratch-resistant sapphire crystal safeguards the intricate details—a hallmark of Rolex’s unparalleled dial artistry.

Movement and Performance

At its heart lies the automatic Calibre 2236, fully manufactured by Rolex, delivering Superlative Chronometer precision (-2/+2 seconds per day after casing). Featuring a Syloxi hairspring in silicon for exceptional stability and magnetic resistance, high-performance Paraflex shock absorbers, and bidirectional Perpetual rotor winding, it provides an approximate 55-hour power reserve. Centre hour, minute, and seconds hands with stop-seconds function ensure flawless, reliable timekeeping.

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Bracelet and Comfort

The Jubilee bracelet in Oystersteel, introduced in 1945 exclusively for the Datejust, features supple five-piece links for outstanding flexibility and comfort. Secured by a concealed folding Crownclasp, it offers a seamless, refined fit that adapts effortlessly to any setting, embodying Rolex’s commitment to ergonomic excellence.

Specifications

• Model: Rolex Datejust 31 (m278274-0016)
• Case Material: Oystersteel and white gold (White Rolesor)
• Bezel Material: Fluted, white gold
• Dial: Dark grey sunray with Chromalight luminescence
• Movement: Automatic Calibre 2236, Manufacture Rolex
• Power Reserve: ~55 hours
• Bracelet: Jubilee, Oystersteel with concealed Crownclasp
• Water Resistance: 100 metres / 330 feet
• Crystal: Scratch-resistant sapphire with Cyclops lens over the date

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FAQs

1. What creates the dark grey dial’s sunray brilliance?

   Masterful brushing forms radiating grooves that diffuse light dynamically, with the dark grey applied precisely and varnished for subtle, shifting depth and lasting vibrancy.

2. Which movement powers this Datejust 31?

   The Calibre 2236 with Syloxi silicon hairspring, Paraflex shock absorbers, and a 55-hour power reserve for superlative accuracy and magnetic resistance.

3. What defines the White Rolesor construction?

   Oystersteel for robust strength and corrosion resistance, paired with white gold for the fluted bezel and noble luster—a timeless Rolex innovation.

4. How does the Chromalight enhance legibility?

   It provides a long-lasting blue luminescence on hands and markers, ensuring clear visibility in low-light conditions for practical elegance.

5. What is the water resistance rating?

   100 metres / 330 feet, thanks to the Oyster architecture and Twinlock crown system, suitable for swimming and everyday exposure.