Datejust 31 Rolesor Yellow Domed Diamond / Jubilee / Black MOP

About This Watch

The Rolex Datejust 31, in its Rolesor iteration with a yellow-gold and stainless-steel case, embodies the quiet authority of a timepiece that has defined elegance since its introduction in 1945. This particular example, with its domed diamond-set bezel and black mother-of-pearl dial, merges the collection’s enduring legacy with a refined, contemporary sensibility. The dial’s deep black hue is offset by the subtle iridescence of the mother-of-pearl, a material that has long been synonymous with Rolex’s mastery of craftsmanship. Gem-set indexes and stick hands add a touch of understated sophistication, ensuring legibility without sacrificing aesthetic restraint. The Jubilee bracelet, with its five-link design, complements the case’s balanced proportions, while the sapphire crystal and 100-meter water resistance underscore the watch’s practicality without compromising its formal demeanor. At its core, the Datejust 31 is powered by Rolex’s in-house Caliber 2235, a self-winding movement distinguished by its precision engineering and the inclusion of a Parachrom balance spring, which enhances resistance to shocks and magnetic fields. This mechanical heart, paired with the collection’s iconic date display at the 3 o’clock position, reflects Rolex’s commitment to both innovation and tradition. The watch’s 31-millimeter diameter strikes a harmonious balance between presence and discretion, making it a versatile companion for both formal occasions and everyday wear. For those who value heritage, craftsmanship, and a timeless aesthetic, this Datejust 31 is a testament to the

In Context

At 31 mm it is small by current standards, in the range most wristwatches occupied before cases began growing through the 1990s. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 48 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

178343-0010 is one of 34 executions of the 178343 base reference. Underneath they are the same watch; what separates this one is a black dial.

Rolex

Green · Yellow Gold, Stainless Steel

178343-0001 · 31 mm

Rolex

Silver · Yellow Gold, Stainless Steel

178343-0002 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

178343-0003 · 31 mm

Rolex

White · Yellow Gold, Stainless Steel

178343-0004 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

178343-0005 · 31 mm

Rolex

White

178343-0006 · 31 mm

Rolex

White

178343-0007 · 31 mm

Rolex

Black

178343-0008 · 31 mm

+ 25 more variants in this family.

The 2235 is the small Rolex automatic of the six-digit generation, a 20 mm movement with a date. It carried the Datejust 31 and the 26 mm Lady-Datejust from around 2000 until the 2236 replaced it. It powers 733 watches in this library. It has 31 jewels, a 48-hour reserve and a beat of 28,800 vph, and every one is a COSC chronometer. It is the same architecture as the [2236](/calibers/rolex-2236) that followed, without the silicon Syloxi hairspring and with seven hours less reserve; the [2236 piece](/blog/the-rolex-2236-the-most-common-movement-in-this-library) explains what changed. The library finds it almost entirely in the [Datejust 31](/brands/rolex/datejust-31): 682 references, the 1782xx generation, whose 45 base references and hundreds of dial variants make that collection the largest here. The 26 mm [Lady-Datejust](/brands/rolex/lady-datejust) of the 1791xx generation accounts for 29, the [Pearlmaster](/brands/rolex/pearlmaster) 29 mm and 34 mm for 19, and the 35 mm Yacht-Master for 3. A six-digit Datejust 31 reference is a 2235; the seven-digit one is a 2236, as the [reference-number guide](/blog/how-to-read-a-watch-reference-number) explains. The 2231 was its no-date sibling in the Oyster Perpetual, and the [3135](/calibers/rolex-3135) its counterpart in the 36 mm cases.

732 other watches in the library run the Rolex 2235.

Rolex

Datejust 31 Yellow Gold Diamond / Oyster / Black MOP

178158-0056 · 31 mm

Rolex

Datejust 31 Stainless Steel Diamond / Oyster / Pink MOP

178384-0061 · 31 mm

Rolex

Datejust 31 Rolesor Everose Domed / Jubilee / Black MOP

178241-0043 · 31 mm

Rolex

Datejust 31 Yellow Gold Domed / Oyster / Champagne Roman

178248-0079 · 31 mm