Maria-Olivia, I think you are making a confusion between two pairs of earrings:
- the earrings worn by Loulou Stoffel are (a replica of?) the earrings of the sapphire and pearl parure made for Marie-Amelie of Bourbon-Two-Siciles, Queen of the French from 1830 to 1848. This parure was a private belonging, and remained in the Orleans Family until the late 1990s, when the former Count of Paris (1908-1999) sold the parure at auction;
- the earrings presented by King Simeon II of Bulgaria to Marie-Thérèse of Wurtemberg, Countess of Clermont (and later Duchess of Montpensier) on her wedding in 1957, and now regularly worn by Marie-Thérèse's daughter-in-law Philomena, Duchess of Vendôme, were part of the sapphire parure of the French Crown jewels, made in 1818-1819, and sold at auction in 1887 by the Government of the French Republic.