Keep this blue balloon. Cartier blue balloon series, ultra-thin watch, blue balloon watch series has always been elegant, the value of blue balloon, Cartier is a famous French jewelry and watch manufacturer, founded by Louis Fran? ois Cartier in 1847 in Lumentogue, Paris, and is regarded as one of the most prestigious jewelry manufacturers in the world. Cartier has a long history of providing jewelry to the royal families of various countries. It was famous in the19th century. At that time, it was called "the king of jewelry" and "the jeweler of the emperor".