Sacro Catino
In 2017, the "emerald vase" was returned to the city in its transparent color, after the restoration carried out by the Opificio delle Pietre Dure in Florence. According to L. Ciatti, protagonist of the restoration attributed to Daniele Angellotto  said it was not obtained from a huge natural emerald, but that it was a simple green glass vase, with no economic value.