This is the only dial on the reference that competes with the bezel. Reference 278289RBR is the 31mm Datejust in solid white gold with a bezel set with diamonds, and this configuration pairs it with a bright blue dial and applied Roman numerals, on the President bracelet. Every other dial here is a neutral, a pastel, a stone or a dark ground, and all of them let the ring of diamonds be the brightest thing on the watch. Saturated blue does not. It holds its own against a set bezel, which means the eye has two places to go rather than one, and the watch reads as considerably more assertive than the rest of the reference.
Saturated lacquer is harder to execute than it looks, because color that dense shows any variation in thickness as a change in tone, and the dial has to stay uniform across its whole diameter for the effect to work at all. Rolex applies it opaque, so there is no depth to the surface and no sense of looking into the dial the way a gradient or a stone invites, which produces a field of pure color with the numerals sitting on top of it rather than within it. The Roman numerals are applied white gold and faceted, drawn for this case size rather than scaled from a larger one, and against a saturated ground they read as bright metal shapes with clear separation, the most straightforward marker-to-ground relationship on the reference. A full sequence occupies a considerable share of a 31mm dial, so the blue shows through in the gaps rather than as an unbroken field. The case is solid white gold rather than a two-metal combination, uniform from the lugs through the bracelet and considerably denser than steel, so the watch carries noticeably more mass than its size suggests. Rolex finishes the flanks polished and the top surfaces brushed, a division that reads more subtly in white gold than in steel. The bezel stones are seated individually into recesses cut in the gold rather than dropped into a preformed channel. The bracelet is the President, semi-circular three-piece links with a concealed clasp, tapering from the lugs toward the clasp so the mass sits forward on the wrist. The date at three displaces the numeral that would otherwise sit there, on a matched disc. The hands are polished white gold and drawn short of the numerals so they cross without appearing to touch them, and Rolex proportions the aperture frame for each case size as well, since a window drawn for a larger dial crowds a smaller one.
The date is the only indication the watch carries beyond the time, and a single aperture is what allows a full Roman sequence to fit at all. Rolex matches the date disc to the dial rather than leaving a white window in a saturated surface. The Cyclops lens above it has been part of the model since 1953 and magnifies the date roughly two and a half times, which makes a small window readable without enlarging it and disturbing the balance of the dial. The date changes instantaneously at midnight rather than creeping through the surrounding hour, the feature the Datejust introduced in 1945 and the one it takes its name from. Correction runs through the winding crown without moving the hands, and nothing the watch asks for requires a tool. The movement is self-winding with a power reserve of approximately 55 hours, an engineering result on a movement built to fit a 31mm case rather than a figure carried down the range, since a smaller barrel has less room to store energy and a proportionally smaller rotor gathers less of it. The rotor winds in both directions rather than only one, which lets a movement this size keep itself running on the wrist movement of an ordinary day. The crown screws down against the case.
The Datejust arrived in 1945 as the first self-winding wristwatch to show the date in a window, and the 31mm case sits between the 28mm Lady-Datejust and the 36mm original. The 278000 generation replaced the 178000 series in 2018 with a revised case and bracelet. Strong dial colors are a comparatively recent development within the model, which ran on silver, white, champagne and black for most of its history, and blue has become the color Rolex reaches for first when introducing a new dial treatment. Roman numerals have never been the volume choice across the model's history. Solid gold references are built in far smaller numbers than the steel and two-metal ones, and the white gold versions in smaller numbers again. The President bracelet was designed in 1956 for the Day-Date and appears here as a borrowing. Within the generation, 278289RBR is the solid white gold reference with a diamond-set bezel. Blue has also reached the precious metal references in smaller numbers than the steel ones, which makes this pairing scarcer than the color's visibility across the catalogue would suggest. Bright blue is one of four grounds this reference offers plain only, with bright black, mint green and white, so there is no set version of the color to move to within the same case.
The buyer for this is not trying to be discreet, which separates it from almost everything else built on this reference. The white gold case is the quietest material Rolex works in and the blue dial is the loudest thing it puts on a Datejust, so the watch is simultaneously understated in what it is made from and emphatic in what it shows, and that combination is rarer than either quality alone. It also carries further than any other configuration here, resolving from across a room where the nacre and gem-set dials lose their effect beyond arm's length. Buyers who found the neutral dials on this reference too reticent generally arrive here and stop looking. It is the configuration here that photographs closest to how it wears, since a solid lacquer holds one value and a camera can record it. Six of the ten grounds at this reference carry stones on the dial, and none of those behaves as predictably in an image.
