This is a small cloisonné dish, a traditional Chinese craft known as "Jingtailan" (景泰藍) or Shippoyaki (七宝焼) in Japanese. The "wired cloisonné" (掐絲琺瑯) technique is used, where patterns are created on a copper base using thin metal wires (copper wires), and then colored glass enamel is filled in and fired.