With the Ballon Bleu watch, Cartier offers a singular vision of roundness, all curves and harmony. A timeless watchmaking icon whose roundness elegantly embraces the skin. Ballon Bleu de Cartier watch, 36 mm. Mechanical movement with automatic winding, day/night. 18K rose gold (750/1000) case set with 54 brilliant-cut diamonds totaling 0.79 carats. Fluted 18K rose gold (750/1000) crown set with a sapphire cabochon. Mother-of-pearl dial with day and night indicator disc. Blued-steel sword-shaped hands. Sapphire crystal. Strap in gray sage alligator leather, 18K rose gold (750/1000) ardillon buc