There is provided a method for subjecting garment accessories to a surface electrolytic treatment, which can advantageously provide various metallic colors to metallic garment accessories in a cost effective manner. The method can provide a first metallic color on one side of outer surface of the garment accessory while at the same time providing a second metallic color on the other side of the outer surface, by placing one or more metallic garment accessories in an electrolytic solution in a non-contact state with an anode and a cathode for passing electric current through the electrolytic solution, passing electric current through the electrolytic solution and generating a bipolar phenomenon on the garment accessory. The method may further comprise the step of controlling the posture of the garment accessory such that the one side of the outer surface of the garment accessory faces the anode and the other side faces the cathode during passing electric current through the electrolytic solution. The method may further comprise the step of polishing at least a part of the outer surface of the garment accessory during passing electric current through the electrolytic solution.