The tsuba is the guard that sits between the blade and the grip on a Japanese sword. A gold-black tsuba refers to a guard finished in a two-tone scheme combining gold-toned metalwork with blackened surfaces. This contrast is achieved through selective patination, plating, or paint treatments applied to an alloy base. On wakizashi in this collection, the effect is used to highlight engraved details — dragon motifs and scroll patterns — making the decorative work stand out clearly against the darker background. It is a purely aesthetic choice valued by collectors for its visual impact and its echoes of traditional Japanese sword furniture aesthetics.