The dial is an island on this watch, and there is exactly one bright thing on it. 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 chocolate dial with a full Roman sequence whose large VI is set with diamonds, on the Jubilee bracelet. Everything around the dial returns light. The bezel is a curved band of stones, the bracelet alternates polished gold with brushed steel along its whole length, and both work continuously. The dial does the opposite, absorbing most of what reaches it. Set into the middle of that dark surface is a single numeral holding stones, and it is the only element on the face doing what the rest of the watch is doing.
Chocolate is the only ground on this reference that absorbs rather than returns, and on a watch specified this heavily that turns out to be the point. Brown is applied as an opaque lacquer in thin coats so the tone stays even across the curve of the dial, and it is pitched to Everose specifically, since the same color in a cool case reads close to black. Against warm metal it separates and holds a genuine brown. That gives the watch a still surface at its center, which it needs, because the two elements framing it are both in constant motion. The Jubilee runs roughly twice the component count of the Oyster across the same width, with polished Everose rows down the middle and brushed steel to either side. The bezel is a dome rather than a flat ring, so its stones sit at continuously varying angles and only an arc of the band is bright at any moment, with that arc traveling as the wrist moves. Neither of them settles. The stones inside the large VI are set into the numeral itself rather than into separate mounts, so the Roman sequence stays intact and the dial keeps a conventional layout. Everose is alloyed with platinum so its tone holds rather than drifting toward yellow with age, and every gold element on the watch is solid rather than plated or capped. The bezel is solid Everose throughout, so on a two-metal watch every set stone sits on the gold side of it and none on the steel.
The mechanism behind all of that is a single function and an old one. The date advances in an instant at midnight rather than drifting through the surrounding hours, which is what the Datejust brought to the market in 1945 and what its name refers to. On a dark ground the window has to be handled carefully, and Rolex matches the disc to the dial so the aperture reads as part of the surface rather than a hole cut into it. The frame around it is proportioned for a 31mm dial instead of scaled down from a larger one, which keeps it clear of the numerals to either side. Above it the Cyclops lens, part of the model since 1953, enlarges the printed numeral roughly two and a half times. Setting the date runs through the winding crown at its own position and leaves the hands where they are. The movement is self-winding with a power reserve of approximately 55 hours, designed around this case width rather than adapted down to it, since a narrower barrel holds less energy and a lighter rotor collects less from the same motion. That reserve carries the watch across a weekend off the wrist. The crown screws down and the Jubilee closes on a concealed clasp folded into the links.
The Jubilee was made for the Datejust and introduced with it in 1945, and the two have stayed associated in a way the bracelet never managed anywhere else in the range. The watch was the first self-winding wristwatch to display the date in a window and has been produced 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. Everose is a much later addition, introduced in 2005. Within the generation, 278341RBR is the steel and Everose reference with a diamond-set domed bezel, and the same dial and bracelet are offered on 278241 under a plain dome instead. The difference is not simply one of quantity. With a plain bezel the chocolate dial is the darkest thing on a relatively quiet watch, and with a set one it is the only quiet thing on a watch that is otherwise entirely active, which is a different role for the same surface to be playing. Chocolate appears on this reference only as a set ground, in two arrangements rather than one.
This configuration suits a buyer who wants a great deal happening and one place for the eye to rest. Watches specified this fully often have nowhere to land, since every surface is competing, and the chocolate dial solves that by declining to compete at all. Whether that reads as balance or as a dark spot in the middle of a bright watch depends on the person, and it is not a distinction a photograph will settle. The Jubilee is the element most likely to be reconsidered, since the same dial and bezel on three broad links produce a noticeably more sober watch carrying exactly the same amount of decoration. Buyers arrive here from the plain-bezel reference having decided the case should carry something, and from the fully set marker rings having decided the dial should not. Both routes end at the same place for the same reason. The dome is also what keeps the bezel from looking like a fitted ring, since a flat band of stones sits on a case and a curved one reads as part of it.
