Green aventurine behaves unlike any other stone Rolex cuts dials from. It is a quartz carrying platelets of mica or fuchsite suspended through the body of the material, and those inclusions catch light at varying depths within the stone rather than reflecting off its surface, which produces a scattered internal sparkle no lacquer or sunray finish can reproduce. Reference 128345RBR is the 36mm Day-Date in Everose gold with a factory diamond bezel, and this configuration sets an aventurine dial inside it with gold hour markers carrying diamonds and diamond-set Roman numerals at six and nine. Deep green against warm rose gold is an unusual pairing for Rolex and a deliberate one.
The 36mm case is Everose gold, the alloy Rolex developed in 2005 so the pink tone holds permanently rather than fading toward yellow as conventional rose gold alloys do. The bezel is set with diamonds in place of the model's fluting. The dial is cut from green aventurine, a hardstone that must be sliced thin, drilled for the hands and both calendar apertures, and finished without fracturing, which is why stone dials fail at a higher rate in production than metal ones and are made in correspondingly small numbers. The material reads as a deep green shot through with fine sparkle that shifts as the wrist moves, and because the inclusions sit at different depths the effect changes with viewing angle in a way a metallic dial does not. Hour markers are gold set with diamonds around the perimeter, and Roman numerals at six and nine, also in gold and also set, give the dial two marker forms and a vertical axis through it. The contrast between the diamonds' hard directional flash and the aventurine's diffuse internal scatter is the dial's central visual idea. The day is spelled in full at twelve, the date at three under a magnifying lens. The President bracelet is Everose gold, semi-circular three-piece links, concealed folding Crownclasp. Aventurine occurs naturally as a quartz carrying mineral inclusions and is not the manufactured glass of the same name, which is the reason the yield is low and the supply genuinely constrained.
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 was the first wristwatch to show the day as a complete word rather than an abbreviation, which needed a larger disc than existing calendar architectures could hold, and Rolex built the movement around that rather than adapting one already in production. Both indications change instantaneously at midnight rather than dragging through the transition over several minutes. Day discs are offered in a wide range of languages and are fixed per watch at manufacture rather than user-selectable, so the language is a permanent specification of the individual piece. Setting runs through a screw-down crown with a double sealing system; nothing on the case requires a tool and there are no correctors on the flank. The self-winding movement holds approximately seventy hours of power reserve, enough that both calendar indications survive a weekend off the wrist. Setting Roman numerals at six and nine while every other position carries a plain gem-set marker gives a busy stone dial two fixed points of structure, and aventurine is one of only two grounds at this reference that take that arrangement.
Rolex has cut dials from decorative stone since the 1970s, beginning with onyx and lapis and widening the material set as cutting and stabilizing methods improved. Aventurine is among the more recent additions and appears most often on the Day-Date and the Lady-Datejust, always on precious-metal cases. Production is constrained by the material rather than by demand: usable slices must be free of internal flaws, the yield after cutting is low, and a stone dial cannot be repolished, matched or repaired, so damage means a replacement carrying a different pattern of inclusions. Within the Everose gold 36mm range this sits above the fluted-bezel 128235 and below the 128395TBR, and the same aventurine dial is offered on this reference with a diamond-set bracelet as well. Eleven grounds are built at this reference and aventurine is one of eight that exist only in set form, with eisenkiesel sharing its thirty-two-diamond hour markers and Roman numerals while three grounds take ten baguette cuts, four take framed markers with baguettes at six and nine, and the paved dial takes sapphires. Only brown ombre, olive green and white can be had without stones at all. Two of those three are never offered set, which leaves the plain end of the roster narrower than the set one by a wide margin.
This appeals to collectors who want a dial that cannot be reproduced. Two examples of this configuration will not carry the same distribution of inclusions, so the specific watch matters more than the specification, and a buyer with a preference needs to see the individual piece. Green has become one of the more pursued colors across the Rolex range over the past decade, and against Everose gold it reads warmer and considerably less severe than the same stone in white gold or platinum. The diamond bezel adds brightness that aventurine can absorb without being washed out, which is not true of every stone Rolex works with. Stone dials at this level of setting are produced in far smaller numbers than metallic ones and surface irregularly, so availability rather than choice governs most purchases. One further point is worth making, and it concerns light. 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. Buyers who have only seen it in one lighting condition have not really seen it.
