It's true. Cartier blue balloon series is one of the classic watch series of Cartier brand, which is famous for its unique design and exquisite craftsmanship. A watch in the Blue Balloon series is matched with 42 diamonds, which are carefully selected by professional jewelers and set in the bezel or dial of the watch. It is true that high-quality diamonds are used and strict jewelry setting standards are followed to ensure the authenticity and stability of diamonds.