This is the only dial on the reference that is both new and cool, and it sits on a watch with no color anywhere else on it. Reference 278344RBR is the 31mm Datejust in a combination of stainless steel and white gold with a domed bezel set with diamonds, and this configuration pairs it with a mint green dial and applied index markers, no stones on the dial at all. The case is colorless, the markers are colorless, the bezel stones are colorless by definition, and the batons carry no information beyond position, which leaves nothing on the watch to look at except the color itself. It is the purest presentation of a dial Rolex builds here.
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, so the tolerances run tighter than on a larger bezel of the same design. White gold is also considerably denser than steel, which means that bezel is noticeably heavier than a steel one of identical dimensions, and on a 31mm case the weight sits at the outer edge where it is most felt. That is the one way the second metal announces itself on a watch where it cannot be seen, since white gold sits close enough to steel in color that most people never register the pairing at all. The dial is an even lacquer applied in several thin coats to keep the tone consistent across a curved surface, pale and cool with no depth to it, which is a departure from the deep saturated greens Rolex has used historically. The applied indexes are white gold and faceted, drawn for this case size rather than scaled from another. The bracelet is the Oyster, three broad flat links brushed across the top with polished flanks, and the date sits at three under the Cyclops lens on a matched disc. Rolex draws the hands for each case size rather than scaling a single set across the range, and the pair fitted here reaches the outer track without overshooting it, a proportion that has to be redrawn whenever the case changes. The date frame is polished white gold set flush with the lacquer so the aperture reads as part of the dial rather than as a cut made into it. Rolex proportions the aperture frame for this case rather than carrying one across the range, since a window drawn for a 36mm dial crowds a 31mm one.
The Datejust shows the date and nothing else. The Cyclops lens over the aperture at three has been part of the model since 1953 and remains the most recognizable thing about it at a distance. 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, hand winding uses the same crown with no separate position to learn, 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 Oyster closes with a concealed clasp folded away inside the links. A movement of this size gathers less from the same wrist movement than a larger one, so the watch does better worn daily than kept aside between outings. Correction takes seconds and requires no tool.
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, which makes it the size for buyers who find one too small and the other too large. The 278000 generation replaced the 178000 series in 2018 with a revised case and bracelet. For most of the model's history the dial range ran to silver, white, champagne and black, and the pastels belong entirely to the current period, arriving across the Rolex catalogue over the past several years rather than emerging from the model's own past. Steel and white gold is the quietest two-metal combination the brand offers. Within the generation, 278344RBR is the steel and white gold reference with a diamond-set domed bezel. Rolex casts its own gold in a foundry on its premises, which is unusual in the industry and is the reason the brand can hold an alloy to a consistent tone across decades of production rather than across a single batch. The 31mm case is also the least discussed of the three Datejust sizes and the one that has quietly absorbed most of the demand that used to go to the smaller references.
The buyer for this wants a color and wants nothing to argue with it. Every other element has been chosen to stay out of the way, which means the watch will be remembered as the mint green one and described that way by anyone who sees it. That is either the appeal or the objection, since a dial this current will read as belonging to a particular period in a way silver and white never will. On the Oyster it stays a watch that gets worn rather than saved, and buyers who like the color but not the delicacy usually associated with it tend to end up on this bracelet. It is also the configuration here most likely to be remembered by someone who saw it once, and the least likely to be mistaken for any other watch in the range. Mint green is one of four grounds here with no set version at all.
