François Chaille is passionate about the history of art, fashion, jewelry, and horology. He has published a dozen books with Flammarion, including The Cartier Collection: Jewelry, Cartier: Innovation Through the Twentieth Century, The Beauty of Time, Coloratura, Cartier Magician, Cartier Royal, Cartier Dazzling, Résonances de Cartier, and High Jewelry and Precious Objects: The Odyssey of a Style. Capucine Juncker, who holds degrees in gemology and philosophy, created Property of a Lady, an online site in French dedicated to the history of jewelry, in 2016. She gives conferences and contributes to publications for both experts and the general public on the subjects of gemstones and jewelry.