The word “jewelry” doesn’t necessarily mean a necklace or a bracelet, and so the “Medusa” exhibition is presenting a set of false nails in diamonds created in 1953 by Mellerio. The beginnings of nail art. “They fit into the fashion of the time for small objects related to beauty like combs and compacts,” explains the jeweler. “But we haven’t yet discovered in our archives for which grand figure of elegance they were created.”