Abstract: In recent years, with the constantly progressing of gemstone faceting cut and grinding technology, a variety of gemstone cut styles are emerging. With the theoretical research on gemstone cut design more deeply, especially with the application of computer aided design, the work becomes fast and efficient. In this study, faceted and special-shaped gemstone cut designs were developed in order to supple the increasing market demand for special-shaped cut style. This paper, combing the modern aesthetics of art and aesthetic theory, the authors focused on the innovative design method of gemstone cut style by means of computer aided design. The design method is as follows:According to the design theme, a new gemstone cut style is planned by the computer software GemCAD; Then a new refractive index model is established by revising the refraction adjustment path which the model can improve the cutting angle to reach the perfect optical effect. The new style model is outputted by using the 3D printing technology which can facilitate observation and processing the gemstone faceting; Finally, the perfect gemstone faceting is carved by exquisite handicrafts. This paper took the design of windmill series as an example to explain the innovative design method of this kind of gemstone faceting cut.