To provide a finger accessory such as an accessory nail and a ring in which its surface is not damaged even after repeated use of nail polish and nail-polish remover to achieve durability, which is of low cost, and which can be colored in favorite color using various nail polish to allow joy of sufficiently unique fashion.

For artificially generating thick and strong coating, anodic oxide coating treatment (alumite treatment) is conducted, and coloring treatment is then conducted. After the coloring treatment, aluminum hydroxide is formed on a surface layer part of pores to apply sealing treatment to close the pores. By this pore closing treatment, the surface becomes smooth, hardness is increased, and corrosion resistance and anti-contamination performance are improved.