Rolesor
Gold is coveted for its lustre and nobility. Steel reinforces strength and reliability. Together, they harmoniously combine the best of their properties. A true Rolex signature, Rolesor has featured on Rolex models since the early 1930s, and was trademarked as a name in 1933. It is one of the prominent pillars of the Oyster collection.


Mother of Pearl Dial
Mother-of-pearl is by its nature full of mystery and surprises. Depending on its origin, it can be pink, white, black or yellow. It differs in colour, intensity and structure according to the part of the shell from which it is extracted. At Rolex, mother-of-pearl is never artificially coloured. Instead, particular know-how and skill are devoted to simply highlighting its natural beauty and preserving the original hues. As all mother-of-pearl dials are unique pieces, an identical dial will never be found on another wrist.
The Oyster bracelet
The Oyster bracelet is a perfect alchemy of form and function, aesthetics and technology, designed to be both robust and comfortable. It is equipped with an Oysterclasp and the Easylink comfort extension link, also exclusive to Rolex. This ingenious system allows the wearer to increase the bracelet length by approximately 5 mm, providing additional comfort in any circumstance.


2235 Movement
The Datejust 31 is equipped with calibre 2235, a self-winding mechanical movement entirely developed and manufactured by Rolex. Like all Rolex Perpetual movements, the 2235 is a certified Swiss chronometer, a designation reserved for high-precision watches that have successfully passed the Swiss Official Chronometer Testing Institute (COSC) tests. Its architecture, in common with all Oyster watch movements, makes it singularly reliable.

The Cyclops Lens
The Cyclops lens enhances the date aperture, magnifying the date display for easy reading. It is one of the most distinctive Rolex features, and one of the most recognisable.
Specifications
- Model case
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Model caseOyster, 31 mm, Oystersteel and white gold
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Oyster architectureMonobloc middle case, screw-down case back and winding crown
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Diameter31 mm
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MaterialWhite Rolesor - combination of Oystersteel and 18 ct white gold
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BezelFluted
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Winding crownScrew-down, Twinlock double waterproofness system
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CrystalScratch-resistant sapphire, Cyclops lens over the date
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Water-resistanceWaterproof to 100 metres / 330 feet
- Movement
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MovementPerpetual, mechanical, self-winding
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Calibre2235, Manufacture Rolex
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Precision-2/+2 sec/day, after casing
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FunctionsCentre hour, minute and seconds hands. Instantaneous date with rapid setting. Stop-seconds for precise time setting
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WindingBidirectional self-winding via Perpetual rotor
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Power reserveApproximately 48 hours
- Bracelet
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BraceletOyster, flat three-piece links
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Bracelet materialOystersteel
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ClaspFolding Oysterclasp with Easylink 5 mm comfort extension link
- Dial
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DialPink mother-of-pearl
- Certification
- Superlative Chronometer (COSC + Rolex certification after casing)
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