Abstract: Silver materials are widely used in crafts and jewelry industry due to their elegant appearance, excellent castability, good weldability, corrosion resistance, and superior formability. However, their high cost and limited colour palette restricts further innovation in jewelry design. This study combined silver (Ag) and copper (Cu) in different content ratios, and designed 5 different coloured silver alloy samples according to compositional gradients, namely Cu80Ag20, Cu60Ag40, Ag50Cu50, Ag60Cu40 and Ag80Cu20. Results from hardness tests, metallographic microscope observations, and colour tests showed that the Ag80Cu20 alloy with lower hardness and the Ag50Cu50 alloy with higher hardness exhibit the better colour performance, which can be utilized as sub-mold and master mold materials, respectively, serving as suitable alloy material for the gold inlay process. Based on this, combined with the traditional gold inlay technique, the work Cheng Dai Gou Yi (Inheritance of Belt Hook Memories) was created with inspiration from belt hook elements, further demonstrating the rich colour expression, the good casting and forming performance, and ductility of the alloy material. In conclusion, coloured Ag-Cu alloys can replace pure silver and enable low-cost production, which suits better for modern jewelry design.