The Lucca Cathedral Museum is located in the historic center of the city. The Museum is located within the complex consisting of the thirteenth-century tower, the sixteenth-century church and the main building of fourteenth-century origin. Since 1992 the Museum has been involved in promoting and enhancing the works of art and furnishings of the Cathedral of San Martino. The collection is very varied and includes collections of statues, stone finds, chalices and candlesticks, goldsmiths, codices, paintings and missals. Among the works of great importance there are: an ivory diptych from the sixth century, a composition of five chorales from the 1300s and a precious “Pisani Cross” made by the Piacenza goldsmith Vincenzo di Michele. The precious equipment used to dress the Holy Face on the days of May 3 and September 14 is exhibited in the Cathedral Museum. The large crown and collar made by Ambrogio Giannoni da Massa, the velvet robe embroidered in silver and gold, are part of the ornaments. Also of great value is the sumptuous French-made gold jewel with enamels and diamonds that was donated to the Cathedral in 1660.