Small size (~24–26 mm) in 18k yellow gold; Swiss quartz calibre; silvered Roman dial; polished bezel; cabochon crown; leather or bracelet. Diabolo de Cartier: rounded case with sculptural, ball‑tipped lugs; silvered or mother‑of‑pearl Roman dial; blued hands; sapphire cabochon crown; sapphire crystal; approx. 30 m water resistance; bracelet or leather/satin strap.