1. National Research Council—National Institute of Optics (CNR-INO), Largo E. Fermi 6, 50125 Firenze, Tuscany, Italy
2. National Research Council—Institute of Heritage Science (CNR-ISPC), Via Madonna del Piano 10, Sesto Fiorentino, 50019 Firenze, Tuscany, Italy
3. Lafarc di Petra Farioli, Via Sauro 1, 42019 Scandiano, Reggio Emilia, Italy
4. Opificio delle Pietre Dure (OPD), Via degli Alfani 78, 50122 Firenze, Tuscany, Italy