Diamond devant-de-corsage, circa 1830 | 鑽石胸針，年份約1830

By family tradition from the collection of Princess Augusta of Bavaria (1788-1851), Duchess of Leuchtenberg. Augusta of Bavaria (1788-1851) was the eldest daughter of the first Bavarian King, Maximilian I Joseph (1756-1825). In 1806, she married Eugène de Beauharnais who was the son of the Empress Joséphine from her first marriage. He was later adopted by Napoleon. Eugène de Beauharnais served as Viceroy of Italy under the First French Empire. After the fall of Napoleon, the couple settled in Augusta's native Munich and were granted the title of Duke and Duchess of Leuchtenberg by her father.

Sotheby's Geneva, November 12, 2014, lot 430

Accompanied by a letter of authentication from Aug. Seiller Fils, 3 Rue du Lac, Vevey, Switzerland, dated 3 August 1932, stating that the jewel belonged to Princess Augusta Amalia of Leuchtenberg, and that it was inherited from her mother [in-law] the Empress Joséphine; and by an insurance estimate from Olsen & Ebann, Chicago 4, Illinois, dated 17 December 1956, stating that this jewel was reputedly owned and worn by Joséphine, wife of Napoleon Bonaparte.