Rolex Datejust 31

Overview

The Rolex Datejust 31 278240 is a refined everyday watch with the versatility, engineering and instantly recognisable design that have made the Datejust one of Rolex’s defining collections. Its 31mm Oystersteel case, smooth bezel and silver sunray-finish dial create a quietly luxurious appearance, while the familiar date display at 3 o’clock adds practical usefulness without disturbing the dial’s balanced proportions.

Presented on Rolex’s classic Oyster bracelet, this Datejust 31 combines the comfort of a three-link bracelet with a clean, contemporary profile. It is equally at home with tailored clothing or more relaxed attire, making it an especially adaptable choice within the dress & classic watches category. The 278240 offers a considered alternative to larger sports watches: discreet, legible and designed for regular wear.

At the heart of the watch is Rolex Calibre 2236, a self-winding mechanical movement developed for dependable daily performance. With a stated power reserve of approximately 55 hours, it offers useful autonomy when removed overnight or over a weekend. The result is a Datejust that expresses Rolex tradition through proportion, restraint and technical confidence rather than overt decoration.

Brand and reference history

Rolex introduced the Datejust in 1945 to mark the company’s 40th anniversary, establishing a combination of automatic winding, a date aperture and a distinctive changing date display. The collection has evolved over many decades, but its central idea remains remarkably consistent: a precise, practical watch with an elegant appearance and a design capable of adapting to changing tastes.

The Datejust 31 occupies the middle ground between more compact ladies’ models and the larger traditional Datejust sizes. Reference 278240 belongs to the modern generation of 31mm Datejust watches and is distinguished by its Oystersteel construction, smooth bezel and contemporary movement architecture. These proportions retain the collection’s classic identity while giving the watch a crisp, current presence on the wrist.

Rolex’s broader catalogue is built around recognisable families, each with a clear purpose. The Datejust is the brand’s quintessential all-rounder, sitting alongside professional tool watches and simpler time-only models. For comparison, the Rolex Oyster Perpetual focuses on uncomplicated timekeeping, whereas the Datejust adds a date function and a more formal visual character.

Dial, hands and design detail

The silver dial is finished with a sunray effect that radiates gently from the centre, giving the surface subtle changes in tone as it catches the light. This finish is particularly versatile: it can appear bright and crisp in direct light, then become softer and more understated indoors. Its neutrality also allows the watch to work with a broad range of colours, fabrics and occasions.

Polished hour markers provide clear points of reference across the dial without making the design feel busy. The hands are shaped for straightforward reading and coordinate with the markers, maintaining the precise visual language expected of a Rolex Datejust. A minute track around the perimeter supports accurate time reading, while the restrained dial layout preserves the sense of calm that defines this configuration.

The date window at 3 o’clock is one of the Datejust’s signature details. Its Cyclops lens, integrated into the sapphire crystal, magnifies the numerals for quick reading and gives the watch an immediately familiar Rolex profile. Rather than being a purely decorative feature, it reinforces the Datejust’s original purpose as a practical watch for everyday life.

With a smooth bezel instead of the more ornate fluted alternative, this reference has a particularly clean and modern character. The bezel frames the dial without competing with it, making the silver sunray surface and polished indices the main visual focus. This is a restrained interpretation of the Datejust, suited to buyers who prefer elegance expressed through finish and proportion.

Case, bracelet and wearability

The 31mm Oystersteel case is compact, durable and carefully shaped to sit securely on the wrist. Oystersteel is Rolex’s corrosion-resistant steel, selected for its ability to withstand the demands of regular use while retaining a refined appearance. Its combination of brushed and polished surfaces creates definition across the case, with highlights that become visible as the watch moves.

The smooth bezel contributes to the case’s understated appearance and gives the watch a versatile presence. The familiar Oyster case construction is designed to provide protection for the movement in daily conditions, while the screw-down crown supports the watch’s water-resistant architecture. As with any pre-owned watch, its current water resistance should be confirmed through appropriate testing before exposure to water.

The Oyster bracelet is formed from three broad links and is one of Rolex’s most enduring bracelet designs. It has a more relaxed and versatile character than a dressier five-link configuration, while still presenting the finishing and solidity associated with the brand. The bracelet flows naturally from the lugs, helping the Datejust 31 feel cohesive rather than overly formal.

Comfort is central to the Oyster bracelet’s appeal. Its articulated links allow it to follow the wrist, and the relatively modest case diameter avoids the top-heavy sensation that can affect larger watches. This makes the 278240 a strong candidate for daily wear, particularly for someone seeking one watch that can move between office, travel and evening settings.

Movement and technical specification

Rolex Calibre 2236 is a self-winding mechanical movement designed for the Datejust 31. Automatic winding uses the movement of the wearer’s wrist to maintain energy in the mainspring, reducing the need for routine manual winding when the watch is worn regularly. Its approximately 55-hour power reserve provides useful flexibility if the watch is taken off for a day or two.

The movement is built around the qualities expected of a modern Rolex calibre: precision, robustness and long-term serviceability. It is protected within the Oyster case, while the automatic winding system supports consistent operation during normal use. The display is practical and uncluttered, showing hours, minutes, seconds and the date without adding unnecessary complications.

• Brand: Rolex
• Collection: Datejust 31
• Reference: 278240
• Case diameter: 31mm
• Case material: Oystersteel
• Bezel: Smooth
• Dial: Silver sunray finish
• Functions: Hours, minutes, seconds and date
• Movement: Rolex Calibre 2236
• Winding: Self-winding mechanical
• Power reserve: Approximately 55 hours
• Bracelet: Oyster bracelet

Mechanical watches benefit from sensible ownership habits. Wearing the watch within its intended environment, avoiding unnecessary impacts and arranging servicing when required will help preserve its performance. The movement’s technical sophistication is important, but so is the care taken by the owner over the years.

Sizing and how it wears

A 31mm case offers a distinctive balance between presence and restraint. It is larger than many traditionally small dress watches, yet noticeably more compact than contemporary oversized formats. On the wrist, the Datejust 31 presents a clear dial and recognisable Rolex profile without dominating the wearer’s overall appearance.

The proportions make it suitable for a wide range of wrists and personal styles. On a smaller wrist, the case can feel substantial enough to look intentional while remaining comfortable. On a larger wrist, it takes on a discreet, classic character that can be especially appealing to buyers who prefer traditional sizing over current trends.

Thickness, lug shape and bracelet articulation also influence how a watch wears, and the Oyster bracelet helps this reference sit close to the wrist. The watch can slide beneath many shirt cuffs while retaining enough visual definition to avoid appearing delicate. Its smooth bezel and silver dial further support this adaptable, quietly confident presentation.

When choosing a pre-owned watch, bracelet sizing should be considered alongside case diameter. The correct fit improves both comfort and security, and any adjustments should be carried out carefully to protect the links, clasp and case. Buyers should also distinguish between the stated case size and the visual impression created by the dial, bezel and bracelet.

Collectability and market value

The Datejust’s enduring appeal comes from its combination of recognisable design and practical usefulness. It is not tied to a short-lived fashion cycle, and the collection’s long history gives the model a strong place within Rolex’s wider identity. Reference 278240 is appealing to collectors who value modern engineering but prefer a measured, traditional case size.

This particular configuration is defined by its versatility. Oystersteel offers durability and everyday practicality, the smooth bezel keeps the design restrained, and the silver sunray dial complements almost any wardrobe. These qualities can make it an attractive proposition for a buyer who wants a Rolex that is easy to wear frequently rather than reserved for occasional formal use.

The asking price for this watch is £5,240. Pre-owned market values can vary according to condition, completeness, service history, age, bracelet fit and the strength of demand for a particular reference or dial configuration. A careful assessment should consider the complete package rather than relying on the reference number alone.

As with other Rolex watches, long-term desirability is supported by the brand’s recognisable design language and global service infrastructure. However, collectability should be viewed realistically: the most suitable purchase is one that combines sound condition, credible authenticity and a configuration that the owner genuinely enjoys wearing.

Authenticity, condition and servicing

Authenticity is fundamental when purchasing any pre-owned Rolex. A proper assessment considers the watch as a whole, including the case, dial, hands, crystal, crown, bracelet, clasp, movement and reference-specific details. No single visual feature should be treated as conclusive in isolation, particularly as genuine watches may show signs of previous servicing or replacement of approved components.

The condition of a Datejust 31 should be judged according to its age and use. Light marks from careful wear may be consistent with a pre-owned watch, while deeper scratches, excessive polishing, bracelet stretch or damage to the crystal can have a more meaningful effect on ownership. The quality of case finishing is particularly important because the transition between brushed and polished surfaces contributes to the watch’s original shape.

Mechanical servicing is part of responsible ownership. Service intervals depend on use, performance and the recommendations applicable to the movement, but a watch that is running inaccurately, losing power unusually quickly or showing irregular date operation should be assessed by a suitably qualified professional. Water resistance should also be checked periodically if the watch is expected to encounter moisture.

We do not claim details that have not been provided, including a particular service date, accompanying accessories or provenance. Buyers should review the supplied condition information and ask any necessary questions before committing to purchase. Clear documentation and an honest description are as important to the buying experience as the watch itself.

Buying this watch from us

This Rolex Datejust 31 278240 is available from us for £5,240. It offers a compelling combination of compact modern sizing, Oystersteel durability, a silver sunray dial and the practical date display that defines the Datejust family. The smooth bezel and Oyster bracelet give it a particularly versatile character, making it suitable for regular use across formal and casual settings.

We aim to make the purchase of a pre-owned luxury watch clear and considered. Product details should be reviewed carefully, and prospective buyers are welcome to request clarification on the watch’s condition, specification or included items before placing an order. Where a detail has not been supplied, it should not be assumed; we will explain what is known and identify anything that requires confirmation.

Choosing a pre-owned Rolex is about more than acquiring a prestigious name. It is about finding the right proportions, dial, bracelet and ownership experience for your lifestyle. The Datejust 31 278240 rewards that approach with a design that is familiar without being showy, technically capable without being complicated and elegant without becoming impractical.

If you are looking for a refined daily Rolex with a neutral dial and a confident but discreet presence, this reference deserves close consideration. Its 31mm Oystersteel case and approximately 55-hour power reserve provide practical foundations, while the silver dial and smooth bezel ensure that its appeal remains rooted in balance and detail.

Frequently asked questions

What is the case size of the Rolex Datejust 31 278240?

The case measures 31mm in diameter. This gives the watch a classic, versatile presence that sits between smaller traditional dress-watch proportions and larger modern formats.

What movement powers this Datejust 31?

It is powered by Rolex Calibre 2236, a self-winding mechanical movement. The movement offers an approximately 55-hour power reserve and displays the hours, minutes, seconds and date.

What colour is the dial?

The watch has a silver sunray-finish dial. Its reflective surface changes subtly with the light, while polished hour markers provide a clean and legible contrast.

Does the watch have the Cyclops date magnifier?

Yes. The date aperture at 3 o’clock is covered by Rolex’s Cyclops lens, which magnifies the date for easier reading and is a signature Datejust design feature.

What bracelet is fitted to the watch?

This reference is paired with Rolex’s Oyster bracelet. Its three-link construction provides a comfortable, durable fit and gives the watch a versatile character suitable for everyday wear.

What is the price of this Rolex Datejust 31?

The listed price is £5,240. Pre-owned watches should always be assessed with attention to their specific condition, configuration and supplied details, as these factors can influence market value.