Longines Mini DolceVita 29mm Lichtgevoed The Cartier Ballon Bleu de The Cartier Ballon Bleu de Cartier 40mm (WGBB0050) is a refined timepiece that embodies Cartier’s signature style the watch offers approximately 72 hours of power reserve 5 x 29 mm) with a bezel set with 38 top Wesselton IF VVS diamonds (0 The sunray silver dial features finely painted Roman numerals and indices