Pre-Owned 
  Cartier Ballon Bleu Watches                    
                
                    
                The Ballon Bleu was released by Cartier in 2006, a quirky yet elegant addition to the brand’s stable of timeless watches. The name is derived from the two most prominent details of the timepiece—the blue synthetic sapphire ‘cabochon’ that is mounted in the crown, and the spherical ‘balloon’ shape of the case.