Opened in the late 19th century and reequipped in 1995, the Museum illustrates the history of production and the manufacture of specialized court work in semi-precious stones (lapis lazuli, agate, calcedoni, Jaspers, etc.), which was founded in 1588 by Ferdinand I de ' Medici. The factory, initially placed at the Uffizi, it was moved to its present location in 1796 and is today transformed in restoration laboratory. The Museum contains beautiful furniture (cabinets, tables, panels for the chapel of San Lorenzo) committed, that is decorated with stones cut and juxtaposed to form with their natural colors of pictorial compositions, or with similar kinds of painting on stone and Canary seed. The exhibition presents the laboratory samples of materials, benches and working tools.