This paper focuses on three purple chalcedony samples. In order to explore the color-forming mechanism of these samples, the authors used such means as polarizing microscope, EPMA, LA-ICP-MS, and UV-Vis spectroscopy. The images and the trace element analysis results were compared with previous studies. It is very probable that the color center caused the pattern for color formation. The formation of purple color was also influenced by trace elements and water in the samples.