Datejust 31 Rolesor Yellow Fluted Diamond / Jubilee / Black MOP Computer

About This Watch

The Rolex Datejust 31, in its Rolesor Yellow Fluted Diamond iteration, embodies a refined balance of tradition and modernity, distinguished by its striking interplay of materials and meticulous craftsmanship. The black mother-of-pearl dial, framed by a yellow gold fluted bezel, exudes quiet sophistication, its iridescent sheen complemented by gem-set indexes that catch light with subtle elegance. The stick hands, paired with a Jubilee bracelet in yellow gold, evoke the enduring aesthetic of the Datejust collection, which has remained a cornerstone of Rolex’s legacy since its introduction in 1945. This reference, with its 31mm case and sapphire crystal, maintains the collection’s signature proportions while emphasizing a contemporary restraint that appeals to discerning wearers. At its core, the watch houses the Caliber 2235, an in-house automatic movement with a date display and a power reserve of approximately 55 hours, underscoring Rolex’s commitment to precision engineering. The closed case back and 100-meter water resistance further reinforce its practicality without compromising its status as a haute horlogerie piece. The contrast between the dial’s deep black hue and the warm luster of the yellow gold creates a visual harmony that is both timeless and distinctive. This watch is for the individual who values understated luxury, seeking a timepiece that transcends trends yet carries the weight of heritage. It suits formal occasions with its polished elegance, yet its discreet design makes it equally at home in the everyday, a quiet testament to the wearer’s discernment.

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.

178313-0026 is one of 31 executions of the 178313 base reference. Underneath they are the same watch; what separates this one is a black dial.

Rolex

Black · Yellow Gold, Stainless Steel

178313-0001 · 31 mm

Rolex

White

178313-0002 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

178313-0006 · 31 mm

Rolex

Silver · Yellow Gold, Stainless Steel

178313-0013 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

178313-0017 · 31 mm

Rolex

Black · Yellow Gold, Stainless Steel

178313-0021 · 31 mm

Rolex

Silver · Yellow Gold, Stainless Steel

178313-0027 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

178313-0028 · 31 mm

+ 22 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