The purpose of this study was to investigate the relationship between Chanel design and her Costume jewelry in 1920"s-1930"s through documentary studies. According to the study the result was as follows: 1. Chanel"s esthetic in the field of Fashion Design bore the double stamp of "elegance" and "simplicity" 2. Chanel changed the concept of costume jewelry. Chanel"s great innovation was that she let "fake" jewels always keep the intrinsic value of "real" ones. 3. The simplicity of her perfectly tailored suit was Paradoxically overwhelmed by a fan-tastic array of jewels. The relationhship be-tween Chanel design and her costume jewelry was not able to be seperated. Chanel was a fashion leader fifty years ago and the name "Chanel" will be at the forefornt of fashon fifty years from now. The image of quality will always remain the same in the futures.