The Sancy, a pale yellow diamond of 55.23 carats (11.046 g), was once reputed to have belonged to the Mughals of antiquity, but it is more likely of Indian origin owing to its cut, which is unusual by Western standards. The stone has been owned by a number of important figures in European history, such as Charles the Bold, James VI and I, and the Astor family.

The Astor family achieved prominence in business, society, and politics in the United States and the United Kingdom during the 19th and 20th centuries. With German roots, some of their ancestry goes back to the Italian and Swiss Alps, the Astors settled in Germany, first appearing in North America in the 18th century with John Jacob Astor, one of the wealthiest people in history.