The French city of Limoges was world famous for the production of champleve enamels during the Middle Ages. During the Renaissance a revival of Limoges enamels took place, but the technique employed was that of painted enamel. Triptychs with a sacred subject, conceived as a painting but shining like jewellery and built with durable materials, became popular. The three works held at the Bargello National Museum in Florence are attributable to Nardon Penicaud (1470-1542), a primary artist with an active workshop. The three enamel paintings came from the famous collection of Louis Carrand, a Lyon antiquarian, who donated them to the Bargello in the 19th century. Their story is told in Ilaria Ciseri's essay. Paola Venturelli analyses the historical and artistic aspects of the works and places them in the context of contemporary enamel production. The final contributions from the Opificio delle Pietre Dure address the conservation of the three delicate enamels and analyses materials and pigments.