“Bleu de Cartier” is a prestigious collection of luxury watches and jewelry designed by Cartier. This collection is characterized by its elegant and sophisticated design, often incorporating distinctive blue elements. The Ballon Bleu model, a part of this collection, is particularly notable for its round case and iconic blue cabochon-shaped crown. Cartier’s Bleu de Cartier collection reflects the brand’s dedication to craftsmanship and timeless aesthetics. For detailed information on specific models, features, and availability, it is recommended to check Cartier’s official sources or consult with authorized dealers.