Cartier, Blue Balloon series, model: WJBB0010, automatic mechanical movement, 18K rose gold, case diameter: 36mm. The entire case is made of solid 18K rose gold (not gold-plated); silver-white radial-grained Geneva wave pattern dial, a distinctive convex sapphire crown at 3 o'clock (the core symbol of the blue balloon), the base of the crown is made of rose gold, and the strap is a bright purple high-gloss crocodile skin.