Eisenkiesel is the least known of the stones Rolex cuts dials from and the strangest to look at. The name is German for iron flint, and the material is a quartz shot through with iron oxide inclusions that give it a smoky brown-grey body with metallic glints suspended inside it, closer to weather than to a color. Reference 128395TBR is the 36mm Day-Date in Everose gold with diamonds set into both the bezel and the lugs, and this configuration puts an eisenkiesel dial inside it with gold hour markers set with diamonds and diamond-set Roman numerals at six and nine.
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 TBR designation marks the setting arrangement: diamonds replace the fluting on the bezel and continue onto the lugs where the case meets the bracelet, which is the detail that separates a TBR reference from one carrying a set bezel alone. Setting the lugs changes the watch from the side rather than from above, because the stones follow the case line into the bracelet instead of stopping at the bezel edge. The dial is cut from eisenkiesel, sliced thin from raw material and selected only where the color and structure meet Rolex's own standard, and because the iron oxide is distributed unevenly through the parent quartz no two slices are alike. Gold hour markers set with diamonds ring the perimeter, with diamond-set Roman numerals at six and nine giving the dial a vertical axis. Against a stone this internally busy, those numerals are doing real work rather than decorative work. The day is spelled in full at twelve, the date at three under a magnifying lens. The President bracelet is Everose gold with semi-circular three-piece links and a concealed folding Crownclasp. Eisenkiesel carries metallic glints inside the quartz rather than a reflective surface, so it answers surrounding diamonds with light of a different quality instead of being flattened by them.
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 over several minutes. 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 that requires 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. Eisenkiesel shares its thirty-two-diamond hour markers and Roman numerals with aventurine and with nothing else here.
Rolex began cutting dials from decorative stone in the 1970s, starting with onyx and lapis and widening the material set as cutting and stabilizing methods improved. Eisenkiesel is among the rarer stones in that range, appearing on a handful of Day-Date and Datejust references and almost nowhere else, and it has never been used on a steel Rolex. Supply 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 entirely. Within the Everose gold 36mm range the 128395TBR sits above the 128345RBR, which carries a set bezel without the lug setting, and well above the fluted-bezel 128235. Diamonds on the lugs sit on a surface that takes more contact than the bezel does, since the lugs are where a watch touches a cuff and a desk edge, and factory seats are cut into the gold rather than mounted on it, which is why the setting survives wear that aftermarket lug work does not. Eisenkiesel is one of eight grounds at this reference that exist only in set form. Only brown ombre, olive green and white can be had without stones.
This is bought by collectors who want a stone that almost nobody can name. Eisenkiesel is not a color anyone asks for by description, and buyers who arrive at it have generally seen one rather than read about one, which is the usual route to the more obscure materials in the Rolex range. Against Everose gold the smoky brown-grey reads warmer than it would in white gold, and the iron glints inside the stone answer the diamonds on the bezel and lugs with light of a different quality. It appeals to established collectors who already own the aventurine and carnelian configurations and want the one that is harder to place, and it turns up rarely rather than predictably, so most buyers take the example they find. One further point bears on the reference, and it concerns availability. Eisenkiesel is among the rarest materials in the Rolex dial range and appears on very few references, so the combination of that stone with the lug setting arrangement is close to the narrowest configuration in the 36mm catalogue. It is also, for that reason, a watch bought on encounter rather than on search, and dealers who come across one rarely hold it long.
