LITERATURE: Eighteen books on the subject of jewellery and Objets d'Art: Antiquorum Auctioneers., The Magical History of Cartier (1996) Auction Catalogue Art Deco, (Grange Books: 2001) Boardman, J., Scarisbrick, D., Wagner, C., The Guy Ladriere Collection of Gems and Rings, (Philip Wilson: 2016) Christie's., Going Once: 250 Years of Culture, Taste and Collecting, (2016) Clais, A., Discovering Van Cleef & Arpels (2001) Day-Lewis, T. Hemmerle: Delicious Jewels (2011) de Guitaut, C., Royal Fabergé (2011) Emerald (Thames & Hudson: 2013) Foulkes, N., Nardi: Venezia (Assouline: 2012) Foulkes. N., Automata, (Editions Xavier Barral / Van Cleef & Arpels: Paris: 2017) Perles: une histoire naturelle (RMN ARTS DECORATIFS EXPOSITIONS: 2007) Pierrat., Collections Collectionneurs (2019) Pierre Berge & Associates., Vente Bijoux, Creations René Boivin, (2005) Auction Catalogue Scarisbrick, D., Rings: Jewelry of Power, Love and Loyalty, (Thames & Hudson: 2007) Sotheby's., Jewels from the Estate of Betsey Cushing Whitney, (1998) Auction Catalogue Sotheby's., The Jewels from the Estate of Thora Ronalds McElroy, (1991) Auction Catalogue Stourton. J., Great Collectors of Our Time: Art Collecting since 1945, (Scala Publishers: 2007) Van Cleef & Arpels: The Spirit of Beauty (2009) Exhibition Catalogue