Two things on this watch are set with diamonds and everything between them is deliberately plain. 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 a dark grey dial carrying an enlarged Roman VI set with diamonds, the remaining numerals plain, with the Jubilee bracelet. A ring of stones around the outside of the case, a single set numeral at the bottom of the dial, and nothing else on the watch decorated at all. The arrangement is symmetrical in intent rather than in layout, since one element is a perimeter and the other is a point. Restraint on a watch this heavily specified is harder to arrange than it sounds.
The lacquer is applied in several thin coats to hold its tone across a curved surface, dark grey being the most neutral of the deep colors Rolex offers here. The stones on the dial are set into the numeral itself rather than around it, following the shape of the letterform, and the enlargement is what makes that possible since a standard VI would not carry enough of them. The remaining numerals are applied white gold left plain. The case is a combination of stainless steel and white gold, the least visible two-metal pairing Rolex makes, and this is worth dwelling on, because a diamond-set bezel on an Everose or yellow gold reference reads as gold with stones on it while here the white gold underneath is nearly indistinguishable from the steel around it, so the bezel reads simply as diamonds. The Jubilee contributes five links across the width with white gold center rows between steel outer links, and again the two metals sit close enough in color that the alternation reads as a change of finish rather than of material. The date sits at three under the Cyclops lens 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 redraws them for each case size rather than carrying a single set across the range. The date frame is polished white gold set flush with the lacquer so the aperture belongs to the dial rather than cutting into it, which on a dark ground stops it reading as a bright interruption. Grey also holds its reading in artificial light better than either of the other two grounds offered with this numeral, since pink shifts warm under a low lamp and aubergine collapses toward black, where a neutral simply stays neutral.
The date is the only indication beyond the time. Rolex matches the disc to the dial, and the Cyclops lens above it has been part of the Datejust since 1953. A single aperture is what allows a full Roman sequence to fit, and the date at three displaces the numeral that would otherwise occupy it. The date changes instantaneously at midnight rather than creeping through the surrounding hour, the feature the model introduced in 1945 and the reason it carries its name. Correction runs through the winding crown without advancing the hands, hand winding uses the same crown, and nothing the watch asks for requires a tool. The movement is self-winding with a power reserve of approximately 55 hours, engineered into a movement built to fit a 31mm case, since a smaller barrel stores less energy and a proportionally smaller rotor gathers less of it. The crown screws down against the case, and the Jubilee closes with a concealed clasp folded away inside the links. Winding by hand runs through the same crown with no separate position to learn, and a movement of this size gathers less from the same wrist movement than a larger one, so the watch prefers regular wear to rotation. 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. The 278000 generation replaced the 178000 series in 2018 with a revised case and bracelet. Steel and white gold is the quietest two-metal combination in the catalogue, and combining it with a diamond-set bezel is the most efficient way Rolex has of making a watch look set without making it look gold. Dark grey has been in the dial range across several generations without ever being the volume seller. Within the generation, 278344RBR is the steel and white gold reference with a diamond-set domed bezel. The 31mm case is 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 enlarged gem-set numeral appears on a small number of dials across the catalogue and always at six rather than at any other position. Rolex offers the enlarged numeral on three grounds across this reference, and grey is the only one of them that is not a color, which is part of why it reads as the most compositional of the three.
The collector this suits wants stones in two specific places and nowhere else. A gem-set marker ring spreads the decoration around the dial and a paved dial removes the ground entirely, and this configuration does neither, holding the stones to a perimeter and a point with a large expanse of plain lacquer in between. That restraint is the argument for it. On the Jubilee the watch reads as more finely constructed than the Oyster version without adding any further decoration, which suits a buyer who wants the detail in the build rather than on the surface. Anyone shopping the pair should expect the decision to come down to the bracelet, since the dial is identical between them. It is the version for a buyer who wants the stones counted rather than noticed. Dark grey takes eight of the reference's thirty-two rows, level with pink and more than any other ground here.
