David Bennett is the Worldwide Chairman of Sotheby's International Jewellery Division and the Chairman of Sotheby's Switzerland. He has sold four out of the five most expensive jewels in auction history. Having worked as an auctioneer at the firm since 1978, Bennett is renowned internationally as an authority on jewelry. He played a key role in numerous illustrious sales, such as the 'Jewels of the Duchess of Windsor' (1987), a tiara from the Collection of Princess Katharina Henckel von Donnersmarck (2011) and Henry IV of France's Beau Sancy (2012). Daniela Mascetti is Sotheby's Chairman of Jewellery in Europe. She joined Sotheby's in 1980, opening the firm's Milan-based department. She is one of Sotheby's most experienced scholars in the history of jewelry, and has collaborated extensively in the sales of historic collections. Her research has assisted with several notable auctions, from The Jewels of the Duchess of Windsor to the collections of Elton John and Gina Lollobrigida.

Regarded internationally as a leading authority in the field of precious stones and jewellery, David Bennett spent 42 years in the role of Worldwide Chairman of Sotheby's jewellery division, a post he held until 2020. During his prestigious career, David sold three of the five most-expensive jewels in auction history, as well as seven 100-carat diamonds, earning him the nickname the '100-carat man'. David has also presided over many legendary, record-breaking auctions, such as the Jewels of the Duchess of Windsor (1987), The Princely Collections of Thurn und Taxis (1992) and Royal Jewels from the Bourbon-Parma Family (2018).