The Madame Royale necklace was inspired by Marie-Thérèse Charlotte, the eldest child of Marie Antoinette and Louis XVI, known by the honorific "Madame Royale." Marie-Thérèse Charlotte was imprisoned from the time of the French Revolution in 1789 till the end of the Reign of Terror in 1794. Her fate is symbolized by a royal fleur-de-lis posed between prison bars and a brick wall.
If you don't see your size, choose "Other" and then enter size.
Only one has ever been made.