This is the only configuration here where both sets of stones sit on metal. 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 Oyster bracelet. Every other ground on the reference is a lacquer or a shell, so the dial stones sit on something that is not metal while the bezel stones sit in solid gold. Silver is a metallic ground. That makes this the one watch here where a diamond has metal behind it wherever it appears, and the difference between the inner and outer sets comes down to which metal rather than to whether there is one.
A metallic ground behaves differently under a stone than a lacquer does. A lacquer holds a fixed value and gives the stone a constant background to separate from. A metallic dial has no fixed value at all, taking whatever the light gives it and reporting it back, running near white in strong light and closer to grey indoors, so the contrast between the stone and its ground changes continuously. The gold settings sit between the two, warm and directional, bright from one side and dull from the others. At each hour position that is three ways of returning light within a few millimeters of one another. Outside the crystal the bezel does something related but simpler, since its stones are cut into a continuous polished surface with a single behavior, and it is a dome rather than a flat ring, so only an arc of the band is lit at any moment. Rolex keeps the dial settings low and tight against the surface, since a raised marker on a case this narrow interferes with the hands before it starts to look generous. Steel takes the case body and the outer bracelet links while Everose takes the bezel, the crown, the bracelet center rows, the marker settings and the hands, all of it solid rather than plated. The Oyster bracelet is three broad flat links, brushed on top with polished flanks, closing on a concealed clasp.
With the numerals removed the marker ring runs unbroken except at three, where the date interrupts it, and a single aperture is as much as a dial arranged this way can absorb before the ring stops reading as a ring. The date changes instantaneously at midnight rather than creeping through the hours around it, the function the model introduced in 1945 and takes its name from. Its disc is matched to the silver ground, which is a harder match than it looks, since a metallic dial has no single value for the disc to be matched against and the compromise has to work across the whole range the ground moves through. The frame is drawn for a 31mm dial rather than reduced from a larger one so it does not crowd the markers beside it, and the Cyclops lens above it, fitted since 1953, enlarges the numeral roughly two and a half times, which matters here because there is no printed character anywhere else on the face to set a reading distance by. Correction runs through the winding crown at a dedicated position, without moving the hands and without anything to press at the side of the case. The movement is self-winding with a power reserve of approximately 55 hours, built for a case this narrow rather than carried down from a wider one, since both the barrel and the rotor are smaller and each does proportionally less work. The crown screws down against the case.
The Datejust has run continuously since 1945, when it became the first self-winding wristwatch to show the date through a window on the dial. The 31mm case sits 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. Silver is among the oldest grounds in the model and gem-set markers among the oldest dial treatments, and the two have been offered together across generations without either leaving the catalogue. What is new is the metal around them, since Everose arrived only in 2005. Within the generation, 278341RBR is the steel and Everose reference with a diamond-set domed bezel, and 278241 offers the identical dial under a plain dome. The bezel is also the one element that does not vary anywhere on this reference. Every dial and both bracelets change from configuration to configuration, and the set dome is the constant that defines the reference, which makes it the thing a buyer chooses first and reconsiders least. Silver arrives set and never plain, one of four grounds on this reference that have no unset version.
The buyer for this wants stones in both places and does not want the watch to look as though it is competing with itself. Silver is what makes that work, since it holds enough brightness of its own that the dial does not become a dark field for the markers to shine out of, and enough neutrality that the bezel is not pushed warm or cool by whatever sits beneath it. The two rings end up reading as the same decision made twice rather than as two separate ones. The Oyster bracelet keeps the wrist plain, which the specification needs. There is a practical argument as well, since a pale metallic dial shows dust and marks less than a lacquer does and hides the small scuffs a crystal picks up over years. Buyers arrive here from the white Roman dial wanting the markers to carry something, and from the darker set grounds wanting the whole watch lighter. Very few arrive from the matched dials, which is a different taste altogether.
