According to the research of experts in jewelry industry, the color of freshwater pearls is the result of the interaction of pigment deposition in shells and external environmental factors. Mo Landi color system is a kind of deep purple. In the process of freshwater pearl cultivation, the effect of Mo Landi color system can be achieved by adjusting the cultivation environment and adding appropriate pigments. In addition, the color of freshwater pearls can also be changed by post-treatment techniques, such as dyeing or heat treatment. Therefore, freshwater pearls can cultivate Mo Landi color system.