Surrounding a stone dial with diamonds on every side is a harder decision than it looks, because most of the materials Rolex cuts dials from lose definition against that much reflected light. Green aventurine does not. Reference 128345RBR is the 36mm Day-Date in Everose gold with a factory diamond-set bezel, and this configuration adds a diamond-set President bracelet beneath an aventurine dial carrying gold hour markers set with diamonds and diamond-set Roman numerals at six and nine. The stone is deep enough and internally busy enough to hold its ground with white stone above, below and around it. Aventurine is one of eight grounds at this reference that exist only in set form, and no two examples of it carry the same pattern.
The 36mm case is Everose gold, the alloy Rolex introduced in 2005 with a stabilized copper content so the pink tone stays fixed rather than drifting toward yellow across decades. The bezel carries diamonds in place of the Day-Date's fluting, and the President bracelet is set as well, which is the considerably harder operation: the links articulate thousands of times a day and every stone has to hold through that flexing, which is why factory-set bracelets are made in far smaller numbers than set bezels. The dial is cut from green aventurine, a quartz carrying platelets of mica or fuchsite suspended through the body of the stone, so the sparkle sits at varying depths inside the material rather than on its surface. That internal scatter is what lets it survive the setting around it: a flat lacquer would read as a dead panel between two bright fields, where aventurine answers the diamonds with light of its own kind. Gold hour markers set with diamonds ring the perimeter, and diamond-set Roman numerals at six and nine give the dial a vertical axis. The day is at twelve, the date at three under a magnifying lens, and the clasp is a concealed folding Crownclasp. Aventurine is at its best under directional light, where the inclusions catch individually and the dial appears to have depth beyond its surface, and at its least interesting under flat diffuse light, where it reads as a plain dark green panel.
The complication set is a day of the week spelled in full and an instantaneous date, with secure rapid-setting for both and a stop-seconds function for setting the time precisely. Nothing else has been added in seven decades. The Day-Date became the first wristwatch to display the day as a complete word in 1956, which required a disc larger than existing calendar layouts could accommodate, and Rolex designed the movement around that constraint rather than adapting one already in production. Both indications jump instantaneously at midnight rather than creeping through the change. Day discs are offered in a wide range of languages and are fixed to the individual watch at manufacture rather than selectable by the owner, so the language is a permanent specification of the piece. Adjustment runs through a screw-down crown with a double sealing system, with no correctors on the case flank and nothing requiring a tool. The self-winding movement carries approximately seventy hours of power reserve. Rolex builds gem-set references to the same mechanical specification as the plainest configuration of the model. Eleven grounds are built at this reference and the display is identical beneath all of them, so the dial and its markers carry the whole of the difference. Aventurine shares its thirty-two-diamond hour markers and Roman numerals with eisenkiesel and with nothing else here.
Rolex has cut dials from decorative stone since the 1970s, starting with onyx and lapis and widening the material set as cutting and stabilizing methods improved. Aventurine is among the more recent additions and occurs naturally as a quartz with mineral inclusions, which is worth distinguishing from aventurine glass, a manufactured material with suspended copper particles used widely elsewhere in watchmaking. Rolex uses the natural stone, so the yield after cutting is low and supply is genuinely constrained. A stone dial cannot be repolished, matched or repaired: damage means a replacement carrying a different distribution of inclusions. Within the Everose gold 36mm range this is the fully set aventurine configuration of the 128345RBR, above the same dial on a plain bracelet and above the fluted-bezel 128235. A hardstone dial cannot be repolished or refinished, and on a piece where the bezel and the bracelet are also set it is the one component that cannot be reworked at all, so it is worth inspecting before anything else. Setting the President is the hardest operation on the watch and the place where aftermarket work most often fails, which makes factory provenance on the bracelet the first check to make on any example. Eleven grounds are built here and only three of them can be had without stones.
This is bought by collectors who want a fully set watch that still has a center. The aventurine supplies the only color on the piece and the only surface that behaves differently from the stones surrounding it, which is what stops the watch reading as an undifferentiated field of light. It appeals to established buyers who already own fully set Day-Dates with metallic or nacre dials and want the one that puts a genuine material at the middle of it, and to collectors drawn to green specifically, which has become one of the more pursued colors across the Rolex range over the past decade. Every example differs in the pattern of inclusions, so the individual watch matters more than the specification, and configurations combining full setting with a hardstone dial surface rarely rather than predictably. Aventurine is the only dial material in the range that answers the surrounding diamonds with light of its own kind rather than absorbing or reflecting theirs, which is why collectors who have handled the paved, nacre and metallic versions at this level of setting so often describe the aventurine as the one that feels finished.
