Datejust 31 Everose Fluted President Black Diamonds

About This Watch

The Rolex Datejust 31, in its 178275f-0020 iteration, embodies the quiet authority of a timepiece that has defined elegance since its introduction in 1945. This particular reference marries the enduring sophistication of the Datejust collection with a striking interplay of materials: a 31mm case in Everose gold, a proprietary alloy known for its warm, enduring hue, frames a dial of deep black lacquer. The gem-set indexes, each meticulously placed, catch the light with subtle brilliance, while the stick-shaped hands trace their lineage to Rolex’s earliest designs, ensuring a balance between legibility and restraint. The President bracelet, with its five-piece links, adds a layer of refinement, its polished finish complementing the case’s luster. At the heart of the watch lies the Caliber 2235, a self-winding movement with a 50-hour power reserve, its precision and reliability underscored by Rolex’s in-house engineering. The sapphire crystal, paired with a closed case back, safeguards the mechanics while emphasizing the watch’s durability—capable of withstanding 100 meters of water, though its presence is more symbolic than functional. The Datejust 31’s heritage as a symbol of understated luxury is evident in every detail, from the fluted bezel to the cyclops lens over the date window. This watch is for those who seek distinction without ostentation, a companion for moments that demand both presence and discretion. It thrives in the quiet confidence of a boardroom, the formality of a gala, or the quiet satisfaction of a well-timed pause in a busy life.

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.

178275f-0020 is one of 19 executions of the 178275f base reference. Underneath they are the same watch; what separates this one is a black dial and a rose gold case.

Rolex

Silver · Rose Gold

178275f-0001 · 31 mm

Rolex

Pink · Rose Gold

178275f-0002 · 31 mm

Rolex

Black · Rose Gold

178275f-0003 · 31 mm

Rolex

Black · Rose Gold

178275f-0004 · 31 mm

Rolex

Silver · Rose Gold

178275f-0005 · 31 mm

Rolex

Pink · Rose Gold

178275f-0008 · 31 mm

Rolex

White · Rose Gold

178275f-0011 · 31 mm

Rolex

Pink · Rose Gold

178275f-0017 · 31 mm

+ 10 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