In the 1963 eponymous comedy series, the character "Pink Panther" symbolizes which precious stone?

The Pink Panther is a series of comedy films (including a series of books and comics) featuring an inept French police detective, Inspector Jacques Clouseau. The series began with the release of The Pink Panther (1963). The role of Clouseau was originated by, and is most closely associated with, Peter Sellers.

In the films, the Pink Panther is a large and valuable pink diamond which is first shown in the opening film in the series. The diamond is called the "Pink Panther" because the flaw at its center, when viewed closely, is said to resemble a leaping pink panther. The phrase reappears in the title of the fourth film "The Return of the Pink Panther", in which the theft of the diamond is again the center of the plot. The phrase was used for all the subsequent films in the series, even when the jewel did not figure in the plot. It ultimately appeared in six of the eleven films.