Mother of pearl arrived in the Journe boutiques in 2012, when the house decided its own shops needed something the retail network could not sell. The Nacre pieces have stayed boutique-only since. On the Automatique Lune the shell is used as an outer ring rather than as a whole dial, so it frames a guilloche center instead of replacing it, which is a more restrained use of the material than most makers attempt. This is the rose gold version, with a 5N guilloche silver center and a pink shell ring around it, and it was made in the second generation of the model. Production of the Nacre Automatique Lune paused, resumed in 2021, and stopped again in 2024. Both case sizes were offered, there was no declared edition size, and the watch underneath is the standard moon phase.
The case is 18K 6N gold at 40 or 42 mm and 10.7 mm deep, polished, unchanged from the standard reference. What changes is the dial, and the construction is worth understanding. The center is silver, guilloche worked and finished in 5N so it matches the case, and around it sits a ring of pink mother of pearl. Shell is not a flat color; it shifts as the wrist turns, and it does so unevenly, which means no two rings are identical and the dial changes appearance with the light in a way a metal dial cannot. Cutting a ring rather than a full disc is the harder option, since the material has to be worked to a consistent thickness across a narrow band without cracking. The date window sits at the top, the moon opens low on the left behind sapphire, and the small seconds counter turns at half past four, all of them positioned exactly as they are on the silvered version. Steel hands cross the whole face and the strap is the standard fitting. From two feet away it reads as a warm dial with a bright edge; up close it reads as two materials. The join between them is the part worth examining, since a shell ring set against a guilloche center has to meet the metal cleanly all the way round and any gap would be obvious at this diameter.
Mechanically this is the same watch as the catalogue Automatique Lune, and the boutique dials never alter what sits behind them. The automatic Octa base is wound by a 22K gold rotor placed off to one side of the movement, turning in one direction only through a self-locking ball bearing system, so that a day of ordinary wear is enough to keep it running. That off-center placement leaves the movement visible through the sapphire back. The date is built from two discs and jumps at midnight, the moon advances a step with it, and the seconds run continuously below the center. Setting is done from the crown, in different positions, with no pushers on the case and nothing hidden in the lugs. The one practical consequence of a mother of pearl dial is that it is more difficult to replace than a metal one, since the material is natural and a new ring will not match an old one exactly, which is a reason to treat the dial with more care than the case. It is also a reason to buy an example whose dial has not been disturbed, because that is the part of the watch that cannot be made again. Everything else on the watch can be serviced in the ordinary way, and the movement in particular is the same one the house has been maintaining since 2001.
The Nacre collection was introduced in 2012 as the second boutique program, after the black dials of 2007 and alongside the Black Label pieces that followed. Six models carried the treatment at various points, in platinum with a blue shell and in rose gold with a pink one, and the pairing of case metal to shell color has never varied. The Automatique Lune version paused for several years, returned in 2021 with the revised dial and the larger case sizes, and was discontinued in 2024. Its sibling, the Octa Automatique Reserve Nacre, stopped in 2016 and never came back, so the moon phase is the one that lasted. Within the boutique programs the Nacre pieces sit between the Black Label watches, which are austere by rule, and the blue dials, which are decorative by choice. Shell is the only material in any of them that the house does not make itself, and the supply of usable material sets a limit nothing else in the collection has. That constraint is also why the Nacre executions were never continuous. They started, stopped, restarted and closed again over twelve years, and the gaps were not commercial decisions so much as consequences of a material that cannot simply be ordered in quantity when a batch of dials is needed.
Mother of pearl divides collectors more sharply than any other dial material, and the ring format is the version most likely to convert a skeptic, since the shell is a border rather than the whole surface. In rose gold with a pink ring the watch is warm throughout and reads as the softer of the two Nacre executions. It suits a buyer who already owns a plainer Journe and wants one that is obviously decorative without being loud about it. Because the reference is discontinued the questions are condition and dial state rather than availability, and the dial is the part that matters, since shell marks easily and cannot be refinished. Boxes and papers are worth having for the usual reasons. Anyone choosing between this and the platinum version should see both, because blue shell and pink shell behave very differently in low light. Pink is the warmer and the quieter of the two, and against rose gold it can disappear into the case entirely under artificial light, which some owners like and others find frustrating.
