A non-metallic article includes a non-metallic substrate, a base coating, a metallic decorative coating, and a light-transmitting protective coating. The base coating includes a prime layer applied on the non-metallic substrate. The metallic decorative coating is deposited on the base coating, and includes a multi-color layer having a multi-color appearance. The multi-color layer is made of a cermet material produced by sputtering from a metal target using a gas mixture containing oxygen, nitrogen and hydrocarbon. The light-transmitting protective coating is applied on the metallic decorative coating.