The bezel is what stops this from being the coolest watch on the reference. Reference 278341RBR is the 31mm Datejust in a combination of stainless steel and Everose gold with a domed bezel set with diamonds, and this configuration carries a silver dial with diamond markers in gold settings and no numerals, on the Jubilee bracelet. Count the surfaces. The dial is cool metal, the case flanks are steel, the outer bracelet rows are steel, and the stones are colorless. Against all of that the warm content is the crown, the narrow center rows of the bracelet, the small marker settings and the bezel, and the bezel is by far the largest of the four. Take it away and the watch reads as steel with gold detailing. Leave it and the balance tips back.
Everose is a large surface here rather than a set of accents, and that is entirely down to the bezel. On the plain-dome version of this same watch the gold appears as a thin rim, a crown, four narrow bracelet rows and a ring of tiny settings, which adds up to very little area against a cool dial and steel outer links. A set dome is a wider band and a more insistent one, and it puts a substantial warm surface directly above a dial that has none. The silver ground beneath is metallic rather than lacquered, so it has no fixed value and takes whatever the light gives it, running near white in strong light and closer to grey indoors, and in either state it sits on the cool side. The Jubilee reinforces that reading by putting the steel into two rows on either side of a single narrow gold row, which is proportionally less gold than the Oyster carries even though it looks busier. The marker settings are solid Everose kept low and tight against the dial, and the stones held in them are colorless and stay bright at any angle. The bezel is a dome rather than a flat ring, its stones sitting at varying angles so only an arc is lit at a time. Every gold element on the watch is solid rather than plated or capped.
Behind all of that the watch runs a single complication. The date advances in an instant at midnight instead of drifting through the surrounding hours, which is what the Datejust introduced in 1945 and what its name refers to. Rolex matches the disc to the silver ground, and matching a metallic dial is harder than matching a lacquer, since the surface it has to agree with changes value continuously while the disc does not. The frame is proportioned for a 31mm dial rather than scaled down from a larger one, keeping it clear of the markers to either side, and the Cyclops lens above it has been part of the model since 1953 and enlarges the numeral roughly two and a half times. With no printed numerals anywhere else on the dial, the date is the only fixed character on the face and the eye uses it to judge scale. Setting it runs through the winding crown at its own position and leaves the hands untouched. The movement is self-winding with a power reserve of approximately 55 hours, designed for this case width rather than borrowed from a larger one, since a narrower barrel stores less and a lighter rotor gathers less from the same motion. The crown screws down and the Jubilee closes on a concealed clasp folded into the links.
The Jubilee was introduced with the Datejust in 1945 and built for it, which is why the pairing reads as original rather than as a choice made afterward. The model was the first self-winding wristwatch to display the date through a window and has been made without interruption since. The 31mm case falls between the 28mm Lady-Datejust and the 36mm original, and the 278000 generation replaced the 178000 series in 2018 with a revised case and bracelet. Rolex registered the name for its steel and gold construction in 1933, on the reasoning that steel does the structural work and gold does the visible work, which this configuration demonstrates more literally than most, since almost all of the structural surface is steel and almost all of the gold is doing something ornamental. Everose arrived in 2005. A silver dial with set markers predates it by decades and would have looked at home on a watch built long before the alloy existed. Within the generation, 278341RBR is the steel and Everose reference with a diamond-set domed bezel, and 278241 carries the same dial and bracelet under a plain dome. Between those two this configuration shifts further than most, because the bezel is the largest warm surface on the watch and removing it changes what metal the watch appears to be made of.
The buyer for this is usually someone who arrived wanting a steel watch with a diamond bezel and found that Rolex does not build one at this size. This is the closest the range comes. A silver dial, steel case flanks, steel outer links and colorless stones keep the whole thing reading cool, and the Everose is concentrated where a diamond bezel needs a mount rather than spread across the watch as a statement about metal. People who have ruled out rose gold on principle should see this configuration before finalizing that. The Jubilee is worth trying against the Oyster, since broad links show proportionally more gold and shift the balance back again. What has to be accepted is that it is unmistakably a gem-set watch, and no arrangement of cool surfaces changes that from across a room. Buyers arrive from the white Roman dial wanting markers that do not depend on the angle, and from the warmer grounds wanting the case metal to stop being the subject.
