Ballon Bleu de Cartier 28The Ballon Bleu de Cartier watch has a 28 mm quartz movement and features a steel case with a fluted crown set with a synthetic cabochon shaped spinel. The silvered opaline dial showcases Roman numerals and blued steel sword shaped hands, all protected bya sapphire crystal. This watch also comes with an interchangeable steel bracelet. With a case diameter of 28. 6 mm and a thickness of 9. 35 mm, it is water resistant up to 30 meters.