Datejust 31 Stainless Steel / Yellow Gold / Diamond / Black MOP / Oyster

About This Watch

The Rolex Datejust 31 Reference 278383RBR-0023 exemplifies the brand’s mastery of blending tradition with refined modernity. Its dial, a deep black mother-of-pearl surface with a high-gloss finish, is framed by gem-set indexes that catch light with quiet precision, while the stick hands add a sense of understated clarity. The case, a harmonious union of stainless steel and yellow gold, reflects the Datejust collection’s longstanding role as a symbol of timeless elegance since its introduction in 1945. The Oyster case, water-resistant to 100 meters, is paired with a sapphire crystal that ensures durability without compromising the watch’s delicate aesthetic. This particular iteration, with its inter

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. 55 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.

278383RBR-0023 is one of 24 executions of the 278383RBR base reference. Underneath they are the same watch; what separates this one is a black gloss dial.

Rolex

White · Yellow Gold, Stainless Steel

278383RBR-0001 · 31 mm

Rolex

White · Yellow Gold, Stainless Steel

278383RBR-0002 · 31 mm

Rolex

Silver · Yellow Gold, Stainless Steel

278383RBR-0003 · 31 mm

Rolex

Silver · Yellow Gold, Stainless Steel

278383RBR-0004 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

278383RBR-0013 · 31 mm

Rolex

Champagne · Yellow Gold, Stainless Steel

278383RBR-0014 · 31 mm

Rolex

Green · Yellow Gold, Stainless Steel

278383RBR-0015 · 31 mm

Rolex

Green · Yellow Gold, Stainless Steel

278383RBR-0016 · 31 mm

+ 15 more variants in this family.

The 2236 is the Rolex movement inside more watches in this library than any other: 907, in the 28 mm Lady-Datejust and the 31 mm Datejust 31. It was the first Rolex caliber with a silicon hairspring. Introduced in 2014 in the Pearlmaster 34, it is a 20 mm automatic with a date, 31 jewels, a 55-hour reserve and a beat of 28,800 vph, certified by the COSC and then tested again by Rolex after casing to the Superlative Chronometer tolerance of two seconds a day. Its distinction is the Syloxi hairspring: silicon, immune to magnetism, etched to a patented geometry that keeps the spring concentric in every position, and paired with Paraflex shock absorbers. The larger Rolex calibers kept the Parachrom alloy spring; Syloxi did not reach a men's movement until the 7140 of 2023. The [2236 piece](/blog/the-rolex-2236-the-most-common-movement-in-this-library) sets out that history. In the library it powers 488 [Datejust 31](/brands/rolex/datejust-31) references, the seven-digit 2782xx generation of 2020, 399 [Lady-Datejusts](/brands/rolex/lady-datejust) of the 2791xx generation of 2015, 15 [Pearlmasters](/brands/rolex/pearlmaster) and 5 [Yacht-Master 37s](/brands/rolex/yacht-master). The [2235](/calibers/rolex-2235) is the 48-hour movement it replaced, the [2232](/calibers/rolex-2232) its no-date sibling for the Oyster Perpetual, and the [3235](/calibers/rolex-3235) its counterpart in the 36 mm and 41 mm cases.

906 other watches in the library run the Rolex 2236.

Rolex

Lady-Datejust 28 Rolesor Everose Diamond / Oyster / MOP

279381RBR-0014 · 28 mm

Rolex

Lady-Datejust 28 Rolesor Rose Diamond / Jubilee / MOP

279381rbr-0013 · 28 mm

Rolex

Lady-Datejust 28 Rolesor Yellow Domed / Oyster / MOP

279163-0014 · 28 mm

Rolex

Datejust 31 Stainless Steel / Yellow Gold / Domed / MOP / Jubilee

278243-0028 · 31 mm