Solid white gold is the most expensive way Rolex knows to make a watch look like it is made of steel. Reference 278289RBR is the 31mm Datejust in solid white gold with a bezel set with diamonds, and this configuration pairs it with a plain white dial and applied Roman numerals, on the President bracelet. The case, the bracelet and the numerals are all white gold throughout, not a two-metal combination and not steel, and to anyone who does not pick it up the watch reads as an ordinary Datejust with a diamond bezel. Only the weight gives it away.
That weight is the whole argument for the reference. White gold is considerably denser than steel, so a solid gold case and bracelet at 31mm carry noticeably more mass than the size suggests, and on a watch that looks identical to a steel one at a glance that difference is the only thing announcing what it is. The bezel is set with diamonds, its stones 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 dial is plain white lacquer finished flat rather than with a sunray, the harder choice since a brushed surface would conceal the small variations a flat white reveals, and it offers nothing to hide behind, so any imprecision in how a numeral is planted shows at once. The Roman numerals are applied white gold and faceted, drawn for this case size rather than scaled from a larger one, reading as shapes by the shadow beneath them rather than by any difference in color from the ground. The bracelet is the President, semi-circular three-piece links with a concealed clasp that folds away entirely inside them. The date at three displaces the numeral that would otherwise sit there. Rolex finishes the case flanks polished and the top surfaces brushed, a division that reads more subtly in white gold than in steel because the metal itself carries less contrast between the two treatments. The hands are polished white gold and drawn short of the numerals so they cross the dial without appearing to touch them, and Rolex redraws them per case size rather than reusing a single set across the range. The President carries a concealed clasp of its own design, folded away so completely that the bracelet appears continuous from every angle.
Against white lacquer the magnified date is about as legible as a date window gets, and a single aperture is what allows a full Roman sequence to fit at all. The Cyclops lens above it has been part of the Datejust since 1953 and magnifies the date roughly two and a half times. 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 crown screws down against the case, and the President closes with its clasp concealed within the links. The rotor winds in both directions rather than only one, which lets a movement this size keep itself running on the modest wrist movement of an ordinary day. Ten grounds are built on that same display here, four of them offered plain and never set, and white is one of the four.
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. White with Roman numerals connects the current reference to that history more directly than any other dial built on it, since the configuration has existed in some form across every generation of the model. The President bracelet was designed in 1956 for the Day-Date and appears on the precious metal Datejust references as a borrowing rather than an inheritance, which is why it turns up on the solid gold references and not on the steel ones. Within the generation, 278289RBR is the solid white gold reference with a diamond-set bezel. Solid gold Datejust references are also built in far smaller numbers than the steel and two-metal ones, and the white gold versions in smaller numbers again, since most buyers reaching for a solid gold watch want it to be identifiable as gold. White sits with bright black, bright blue and mint green among the four grounds here that are never offered set, while dark grey, pink and silver appear in both forms and aubergine, red ombre and white mother-of-pearl exist only with stones.
The buyer for this wants the watch to cost what it costs and to say nothing about it. A yellow or rose gold Datejust announces itself from across a room before any other quality registers, and white gold refuses that entirely, which makes this the most discreet way to own a solid gold watch that Rolex offers. The diamond bezel is the only element that hints, and even that reads as brightness rather than as metal. It is also the most legible dial on the reference, resolving instantly in any light where the gem-set and gradient configurations ask for a second look, and buyers who intend to wear the watch daily rather than for occasions tend to weigh that heavily. There is a practical dimension as well. A watch that reads as steel attracts none of the attention a gold one does, and for buyers whose reason for wanting solid gold has nothing to do with being seen to own it, this is the only configuration in the range that answers cleanly.
