This brooch belonged to Prince Rainier III’s grandmother, who had passed away before Grace Kelly joined the Grimaldi family. His grandmother's lineage was from the House de Polignac and was Mexican born, Susana Mariana Estefania Francisca de Paula del Corazon de la Torre y Mier y Teran. Once married, Princess Grace received this heirloom which was to stay in her possession as long as she was married to the living Prince. Some years later, Grace added the bail and chain to the brooch to make it more versatile. Our rendering of the House de Polignac Brooch is 18k gold plated with enameling and Swarovski Crystals. It may also be worn as a pendant with the included chain that measures 18 inches plus a 3-inch extension.