Royal Ammar bin Humaid Al Nuaimi spotted wearing a Audemars Piguet

Sheikh Ammar bin Humaid Al Nuaimi, Crown Prince of Ajman and a figure with a well-documented appreciation for haute horlogerie, was recently spotted on the wrist with the newly released Audemars Piguet Royal Oak Perpetual Calendar in blue ceramic — reference 26579CS. The sighting places one of the Gulf region's most watch-literate royals firmly in the conversation around what is arguably the most technically ambitious iteration of the Royal Oak family currently in production.

The 26579CS is built around a 41mm case and integrated bracelet machined entirely from blue ceramic — a material that demands extraordinary precision in manufacturing due to its extreme hardness and brittleness. Audemars Piguet's ability to reproduce the Royal Oak's signature beveled, polished finishing on ceramic is a genuine industrial achievement, maintaining the visual language Gerald Genta established in 1972 while pushing material science to its limits. The dial continues the Royal Oak's tapisserie motif and carries the perpetual calendar's full suite of indications: date, day, month, leap year, and moon phase.

Powering the 26579CS is Calibre 5134, a self-winding movement with a 40-hour power reserve that incorporates AP's perpetual calendar mechanism — programmed to account for the Gregorian calendar's irregularities without requiring manual correction until 2100. The movement is visible through a sapphire caseback, itself a feat given the ceramic case construction. This calibre has long been regarded as one of the most reliable and legible perpetual engines in Swiss watchmaking.

From a collector's standpoint, ceramic Royal Oaks occupy a distinct tier. They appeal to buyers who want the mechanical substance of the steel or precious metal references but demand a contemporary material statement. The blue ceramic perpetual calendar is a limited-production piece, and its arrival on the wrist of Sheikh Ammar — a royal whose watch choices carry weight in Gulf collector circles — gives it immediate visibility in a market where provenance and high-profile ownership matter.

At a list price of $147,500, the Royal Oak Perpetual Calendar 26579CS sits at the upper end of AP's non-minute-repeater range. Grey market premiums on ceramic Royal Oak complications have historically been modest compared to steel sports references, but the combination of a fresh release and royal-wrist exposure is unlikely to soften demand in the near term.