This set was one of the only surviving pieces of the French crown jewels from the collection originally started by Francois I in 1530. The majority of the remaining crown jewels had disappeared during the revolution - they were probably broken down and sold.
Marie-Thérèse wore these on her wedding day. When Napoleon Bonaparte's empire collapsed and the Bourbon dynasty was restored the jewels became the property of the Bourbon princess. She was to be the last royalty of France to wear them - after the second revolution, the bracelets managed to survive and is now on display at the Louvre.