Stones at every hour, stones around the bezel, and a pale ground with nothing to help either. Reference 278289RBR is the 31mm Datejust in solid white gold with a bezel set with diamonds, and this configuration carries a pink dial with gem-set markers in white gold settings, on the President bracelet. It is the most heavily decorated pink the reference offers and the hardest of the three to execute, since a light dial gives a diamond almost nothing to be read against and the whole effect has to be carried by how the markers are mounted rather than by contrast.
That mounting is the technical content of the dial. Each marker sits in a white gold setting raised slightly proud of the surface, and the shadow beneath the setting registers before the stone does, which is why height rather than brightness is what makes a gem-set pale dial legible. Rolex keeps those settings low and tight, both because a light ground exposes any misalignment with nothing to hide it behind and because a raised setting on a 31mm dial has little room before it starts to crowd the hands, which are drawn narrow for the same reason. The lacquer is applied in several thin coats to keep the tone even across a curved surface, opaque and staying nearer to rose than to coral against white metal. Gem-set markers also occupy a fraction of the dial that a Roman sequence would, so more of the color shows here than on either of the other two pink configurations, which makes this simultaneously the most decorated and the pinkest of them. The case is solid white gold rather than a two-metal combination, uniform from the lugs through the bracelet and considerably denser than steel. The bezel stones are seated individually into recesses cut in the gold rather than dropped into a preformed channel, and on a ring this small there is less circumference to absorb an error. The bracelet is the President, semi-circular three-piece links with a concealed clasp folded away so completely that the bracelet appears continuous from every angle. The date sits at three under the Cyclops lens on a matched disc. Rolex also matches the height of the marker settings to the height of the date frame, so the dial reads as one plane with elements standing off it rather than as several plates at different levels, and on a ground this pale that consistency is what stops the surface looking assembled from parts.
The Datejust shows the date and nothing else, and a single aperture also keeps the marker ring uninterrupted, since a second window would break a pattern that depends on running continuously. 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 unbalancing 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, and Rolex draws the bracelet to taper from the lugs toward the clasp so the mass sits forward on the wrist.
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. Gem-set dials have been part of the model for most of its history and remain a minority of what Rolex builds in any given year. Gem-set markers also reached the pale dials later than the dark ones, since the setting problem is harder on a light ground and the brand solved it on high-contrast dials first, which is part of why the pale gem-set configurations are still built in smaller numbers. Solid gold references are built in far 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. Pink reached the solid gold references at the same time as the steel ones rather than later, which is unusual for a color of this kind. Pink is one of three grounds at this reference offered plain as well as set, and one of two whose set form comes in two arrangements, the diamond hour markers here and a large Roman six carrying eleven stones.
The collector this suits wants both the color and the stones and is not willing to trade one against the other. The Roman version sacrifices color for structure, the index version sacrifices decoration for color, and this is the only one of the three that refuses to choose, which is why it is also the least legible of them and depends entirely on the light to be read at all. That is the cost, and buyers who want the dial rather than the utility accept it knowingly. On a solid gold case with a set bezel the watch is decorated on every surface except the bracelet, which makes the President the only restraint anywhere on it. Anyone shopping the three pinks should expect to decide on how much dial they want to see rather than on how set they want the watch to be. Five of the ten grounds here take the same diamond hour markers, so this is the more common of the two set treatments the reference builds.
