Audemars Piguet Royal Oak 15551ST 'Blue Diamond'
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Find me one like itAudemars Piguet Royal Oak 15551ST Blue Diamond: Full Set, Unworn
The 37mm Royal Oak sits between the classic 36mm and the 41mm, and the current generation brought it the calibre 5900, a slimmer case profile and a refined bracelet. The 15551ST is the version with a factory diamond set bezel, which turns the most recognisable octagon in watchmaking into something quietly exceptional.
This example is from 2026, delivered as a full set and never worn. The blue Grande Tapisserie dial and the factory diamonds make it one of the most elegant steel Royal Oaks in the current collection.
Design & Movement
37mm stainless steel case with factory diamond set bezel, blue Grande Tapisserie dial with applied indexes and date. Automatic calibre 5900. Fitted to the integrated steel bracelet.
Provenance & Condition
Full set, 2026. Unworn.
The Royal Oak 15551ST: steel and diamonds, exactly as AP intended.
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Brand: Audemars Piguet
Model: Royal Oak
Reference: 15551ST
Bracelet: Stainless steel, integrated
Dial: Blue Grande Tapisserie
Case: Stainless steel, factory diamond set bezel
Dimensions: 37mm
Box: yes
Paperwork: yes
Year: 2026