Mosaic material alloy embeds one or more soft metal materials into a hard metal substrate to increase hardness and aesthetic effect. The inlay material alloy is based on copper alloy or brass, and then inlaid with precious metals such as silver, gold, aluminum and tin. This alloy has high hardness, high bending strength and excellent wear resistance, and is mainly used in cutting tools, drilling tools, wear-resistant parts, molds and so on.