Two of the twelve dials on this reference are offered both plain and set, and blue ombre is one of them. The other is ice blue. Every remaining ground on 128396TBR is fixed in one state or the other, so a buyer who wants a graded blue dial and does not want stones in it has a real choice here rather than a compromise, and the unset version is also the one that reaches the larger platinum case. Stones restrict this ground rather than extending it. Left plain, blue ombre appears at both sizes and on white gold as well; set, it contracts to the 36mm cool-metal references and stops.
The ground is a single blue laid so its density rises continuously from the middle of the dial outward, pale at the center and deep at the rim, with no seam anywhere in the transition. Blue carries that treatment better than most colors because it stays recognizable across a wide range of values, so a gradient reads as one color gaining depth rather than as two colors meeting somewhere in the middle. Without stones the effect is uninterrupted, and the dial behaves less like a surface than like something with depth to it. The markers are applied Roman numerals in white gold, tall and narrow with fine serifs, standing proud of the ground with polished faces. Their placement puts them where the gradient is already darkening, which is why they read cleanly at a glance despite carrying no stones and no outline. The numeral at three gives way to the date window, so the ring is interrupted at one point, and the day arc at twelve sits above the numeral position rather than replacing it. The case is 36mm in 950 platinum, the bezel is set with diamonds around its full circumference, and the President bracelet runs from the lugs in polished semi-circular links.
On a plain dial the calendar is the only thing happening, and the Day-Date makes that a virtue rather than a shortage. The day is written out in full at twelve instead of abbreviated, which is what separates the model from every other Rolex, and the date sits at three under a lens set into the crystal. Both discs are printed on a flat background rather than a graded one, since a rotating disc cannot carry a gradient that would align with the dial behind it at every position. That mismatch is managed by the frames, which mark the boundary firmly enough that the eye reads two intentional insets rather than a color that failed to match. Both indications change instantaneously at midnight rather than creeping through the preceding hour, so the watch is never caught showing half a word. The movement runs roughly seventy hours off a full wind, which covers a weekend off the wrist. Setting is done entirely through the crown, with the calendar advanced by running the hands rather than through correctors set into the case band, which is why the flank stays smooth all the way into the bracelet. Nine grounds are built at this reference and blue ombre is one of only two offered both plain and set.
The Day-Date is built only in platinum, yellow gold, white gold and Everose, always on the President bracelet, and never in steel, so there is no economical version and the plain dials are a stated preference rather than a lower rung. Blue ombre is one of five grounds that appear on both platinum sizes, alongside ice blue in both its forms, white, and mother-of-pearl set with diamonds. That crossing matters more than it sounds, because the two sizes otherwise draw on largely separate rosters: the 36mm case takes the pastels and the delicate stones, the 40mm case takes bright black, slate and meteorite, and only those five grounds are available either way. Within 36mm platinum the field is two references, this one and 128236, which differ at the bezel and nowhere else. Blue ombre with Roman numerals exists on both, so a buyer who has settled on this dial is choosing a ring and nothing more, and the fluted alternative is the more conventional of the two by some distance. The asymmetry between plain and set forms is worth following further, because it does not run in one direction. Blue ombre loses size when it gains stones. Silver does the opposite: plain, it reaches platinum, white gold and yellow gold and never Everose, while silver set with diamonds does appear on Everose, so there the stones open a metal rather than closing a size. Champagne exists in both states but only on yellow gold. Bright black exists in both states and only on the larger case. There is no consistent relationship between setting a ground and where it is then permitted to go, which means the roster has to be read rather than reasoned out. For blue ombre the practical consequence is simple enough. The plain dial is the one with reach, available on both platinum sizes and on white gold besides, so a buyer who wants a graded blue Day-Date and has not settled on a diameter should know that the unset dial keeps that decision open and the set dial closes it.
A plain ombre dial under a bezel set with diamonds is a deliberately unbalanced watch, and people either want that or they do not. The dial is doing subtle work, a gradient that only resolves properly in good light, while the bezel is doing the opposite, and the two halves of the watch never quite agree. Collectors who find that tension appealing tend to describe it as the dial being allowed to stay serious while the case is not, and there is something to that reading. It also has a practical advantage over the set version of the same ground: with no stones on the dial the gradient runs unbroken from center to rim, and the effect is stronger for it. For a buyer who wants color on a platinum Day-Date, wants the setting on the bezel where it can be seen from outside the watch, and wants the dial itself left alone, this is the configuration the reference is pointing at.
