“Bleu de Cartier” is a distinguished collection of luxury watches and jewelry created by the renowned French jeweler and watchmaker, Cartier. Known for its elegant design and often featuring distinctive blue elements, this collection showcases Cartier’s commitment to craftsmanship, quality, and timeless style. The Ballon Bleu model, part of this collection, is particularly notable for its round case and signature blue cabochon-shaped crown. For specific details about the various models and availability, it’s recommended to refer to Cartier’s official sources or consult with authorized Cartier dealers.