Reference 126515LN is the Cosmograph Daytona in Everose gold with a black ceramic bezel on a rubber strap, and this configuration pairs that case with a bright black dial carrying Sundust counters and diamond hour markers. Sundust is Rolex's name for a warm champagne-pink tone, developed to sit alongside Everose gold rather than against it, and using it for the counter rings on a black dial produces a layout with three warm circles set into a dark field. The diamonds set as hour markers pick up the same warmth from the case. The Oysterflex strap is the element that repositions the whole watch: a Daytona on rubber reads as contemporary in a way the bracelet references do not, and pairing that with Everose gold and gem setting produces one of the more deliberately modern watches Rolex currently makes.
The 40mm case is Everose gold, the alloy Rolex developed so its rose tone remains stable across decades rather than drifting toward yellow. The bezel is black ceramic with a molded tachymetric scale, a monobloc component rather than an engraved metal ring, and the scale is filled with metal deposited into the ceramic surface. Against Everose gold the black ceramic is the strongest contrast Rolex applies to any Daytona, and it is the reason this reference reads darker than its case metal suggests. The bright black dial is flat and deep, with three recessed counters ringed in Sundust, and diamonds set as hour markers around the perimeter. Applied Everose gold hands run above the field. There is no date aperture. The Oysterflex strap is a metal blade overmoulded in elastomer, which gives it the shape retention of a bracelet and the surface of a rubber strap, and it fastens with a folding clasp in Everose gold carrying an extension system. On the wrist the effect is lighter than a gold bracelet by a considerable margin, which changes how the watch is worn more than any dial decision could. The markers are diamonds set in gold, and on a Sundust ground they read as brightness rather than as contrast, which is the opposite of how the same setting behaves on a black dial.
The complication is a chronograph, measured across three counters for elapsed seconds, minutes and hours, alongside the running time. There is no date on any Daytona and there never has been. The molded tachymetric scale converts an elapsed interval into a rate, the function the Cosmograph was named for, and on the ceramic bezel it is permanent in a way an engraved metal scale is not: ceramic does not wear or discolor, and the scale will read identically in thirty years. Chronograph operation runs through screw-down pushers either side of the crown, unthreaded before use and threaded back afterward. The self-winding movement holds approximately seventy-two hours of power reserve, consistent across the current Daytona generation. What the ceramic bezel changes functionally is durability rather than capability, and it is the single most consequential material decision Rolex made in the modern Daytona: the metal bezels on the gold bracelet references soften and mark over years of wear, while ceramic does not. That difference is why the ceramic-bezel references have gradually become the default reading of the model. Five dials are built at this reference and this is the only one carrying stones, the other four being plain, and all five come on the Oysterflex.
The Oysterflex strap arrived on the Daytona in 2017 with the 116515LN in Everose gold, and it was the first time Rolex had put a chronograph of this standing on rubber. The reception was mixed initially and shifted quickly, and within a few years the rubber-strap gold Daytonas had become among the most requested references in the range. The 126515LN replaced the 116515LN in the 2023 generation, bringing the revised bezel surround, slimmer counter rings and the current movement family while holding the case at 40mm. Rolex offers the same format in yellow gold as the 126518LN and in white gold, and the Everose version is generally regarded as the one where the material combination works best, because the black ceramic and the warm rose tone are further apart than black and yellow gold are. Within the wider catalogue this reference sits opposite the 126508, which puts a comparable gold case on a metal bracelet with a metal bezel, and the two are effectively different arguments about the same watch. Rolex keeping both in production rather than replacing one with the other is characteristic. The company rarely resolves this kind of question, preferring to let the catalogue carry two answers until one of them stops selling, and neither of these has shown any sign of doing that.
The diamond-set Sundust configuration appeals to collectors who want a gold Daytona that does not look like the gold Daytona everyone else has. The combination of black ceramic, Everose gold, a black dial with warm counters and diamond markers is specific enough that the watch is identifiable across a room, and it is ordered in far smaller numbers than the plain-dial version of the same reference. Buyers tend to be established collectors rather than first-time Daytona owners, usually with a steel example already and a preference for the rubber strap over the bracelet. It wears lighter than any gold Daytona on a bracelet, which makes it more practical than its appearance suggests. The Sundust counters are the detail that rewards a second look, because at a distance they read as plain champagne and only resolve into their warmer tone up close. What it does not do is disappear, and a collector looking for a discreet gold chronograph is looking at the wrong reference. For collectors who want the Everose gold and ceramic combination without the stones, the plain black dial version of the same reference exists and is easier to find, and choosing between them is a decision about how much of the watch should be about the dial rather than the case. Most collectors who handle both end up choosing on weight of impression rather than on the stones themselves. The diamond version asks to be looked at and the plain one does not, and there is no wrong answer to that question.
