Pierre Rainero is director of Image, Style and Heritage at Cartier. Margaret Young-Sánchez is the Frederick and Jan Mayer Curator of Pre-Columbian Art at the Denver Art Museum. Martin Chapman is curator in charge of European decorative arts and sculpture at the Fine Arts Museums of San Francisco. Michael Hall is curator of the Rothschild collection at Exbury, Hampshire, England. Stefano Papi is former senior European specialist in the jewelry departments of both Sotheby’s and Christie’s. Janet Zapata is an independent scholar specializing in jewelry and silver.