Datejust 31 Stainless Steel Domed / Jubilee / Black Roman

About This Watch

The Rolex Datejust 31, in its 178240-0035 iteration, embodies the quiet refinement of a design that has defined luxury watchmaking for generations. With a 31-millimeter stainless steel case, its domed profile and polished edges evoke the timeless elegance of the Datejust collection, first introduced in 1945 as a symbol of precision and accessibility for the modern gentleman. The black dial, adorned with luminous Roman numerals and sleek stick hands, offers a striking contrast to the polished stainless steel, while the subtle beveling of the case and the refined curvature of the Jubilee bracelet underscore the watch’s commitment to understated sophistication. The sapphire crystal, paired with a water resistance of 100 meters, ensures durability without compromising the watch’s refined silhouette. At its heart lies the Caliber 2235, an automatic movement distinguished by its Parachrom balance spring, which enhances accuracy and resilience against shocks. This technical precision, combined with the Datejust 31’s heritage as a benchmark for enduring design, positions it as a piece that bridges tradition and contemporary craftsmanship. The watch’s proportions—neither too large nor too small—make it a versatile companion for both formal occasions and everyday wear, its presence as commanding as it is discreet. For those who value heritage without sacrificing modernity, the Datejust 31 is a testament to the enduring appeal of a watch that has remained largely unchanged since its inception, yet continues to evolve with the quiet confidence of a true icon.

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.

178240-0035 is one of 24 executions of the 178240 base reference. Underneath they are the same watch; what separates this one is a black dial and a stainless steel case.

Rolex

Grey · Stainless Steel

178240-0001 · 31 mm

Rolex

Silver · Stainless Steel

178240-0005 · 31 mm

Rolex

Grey · Stainless Steel

178240-0006 · 31 mm

Rolex

Black · Stainless Steel

178240-0011 · 31 mm

Rolex

White · Stainless Steel

178240-0015 · 31 mm

Rolex

Black · Stainless Steel

178240-0016 · 31 mm

Rolex

Pink · Stainless Steel

178240-0017 · 31 mm

Rolex

Black · Stainless Steel

178240-0019 · 31 mm

+ 15 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