Ballon blue boasts great popularity since its announcement in 2007. Since its introduction, it has quickly become a masterpiece of Cartier. As the name Baron Bleu (blue balloon) suggests, it floats like a balloon, and the world of circles spreads from the entire case to the convex lens. The crown is painted blue sapphire, and the hands are painted dark blue. The reason for this is that in Europe, blue has long been considered a color that brings happiness, and it has the meaning of an amulet that wishes for happiness. Baron Bleu is a model that can be worn casually regardless of gender. The rounded silhouette is attractive, and the variation is rich, changing from simple to luxury.