Hard Enamel (Cloisonne): A die is created to imprint your design into the metal. Colors are hand filled with a powdered glass-like mixture in each recessed areas of metal. After each fill, the piece is blazed harden and polished until perfect and then gold or silver or nickel plated. Cloisonne has a long history in China. Up to now, we still use it because of it’s high quality and durability. It could be kept in it's best quality over 100 years and resistant to scratch, heat, humidity & acidic chemicals.