Introduced: 1985

Purpose / Inspiration: The Must 21 was born out of Cartier’s mission to make luxury more accessible during a challenging era. It followed the success of the Must de Cartier line—a response to the Quartz Crisis—offering the Cartier look at a more attainable price point. The 21 took that formula sporty with steel and gold fusion and a unique modern touch.

Designer: Part of the Alain-Dominique Perrin era, focused on reimagining Cartier’s legacy for a younger, broader audience

Case size: ~31mm for midsize (unisex), ~28mm for small, ~34mm for larger models

Case options: Stainless steel with fluted 18k yellow gold or vermeil bezel

Powered by Swiss quartz movement (Cartier signed ETA base)

Bezel: Fixed, fluted bezel—signature “sunray” ridged design in gold tone

Dial options: Silver guilloché, champagne, or matte white—always minimalist, often with classic Cartier Roman numerals and blue sword hands

Water resistance: Basic splash resistance; not built for immersion

Bracelet: Integrated steel bracelet with hidden clasp—distinctive polished center links

Discontinued in the early 2000s

Spirit lives on in: Models like the Ronde Solo and updated Must de Cartier Tank variants

Why it mattered: It wasn’t just “a Cartier you could afford.” It was a Cartier that didn’t cut corners—timeless, gender-neutral, and unmistakably bold for its era

Iconic Without Trying: The ridged bezel, the Roman numerals, the blue hands—Cartier in shorthand

Luxury for the Times: Must de Cartier 21 made high design wearable without apology

Everyday Elegance: Steel strength, gold bezel flash, Cartier dial class

Built for the 9-to-5 and the 9PM Dinner: A watch that dressed up or down without blinking