Complete set, Cartier, model: WJBB0057, Ballon Bleu series, 18k rose gold, 40mm diameter The iconic convex sapphire crown on the left side of the case is the core identification design of the Blue Balloon. The arc-shaped convex sapphire crystal features a soft and magnifying effect. The entire watch is made of 18K rose gold, featuring a case, a three-link metal bracelet, and a bezel encircled by factory-set round brilliant-cut diamonds. Dial design Silver-gray radiating sun dial, black Roman numeral hour markers, blue steel hands; The date display window at 3 o 'clock is marked with "AUTOMATIC" on the dial, representing an automatic mechanical movement.