Our cloisonne pins is the fine-art tradition of glass enameling, it started in China centuries age. The pins are made from hand-prouing powdered glass into the recesses of a die-struck (stamped) brass base. The brass can be plated in gold,silver,or nickel. After being baked at a very high temperature, the glass enamel is sanded and polished to be flush with the metal lines that separate the colors. This gives the pins a smooth and lustrous quality.