Ametrine is a semiprecious stone that is a combination of amethyst and citrine in the same crystal, giving it a blended purple and yellow appearance. It is a type of quartz containing small amounts of iron impurities that cause its colors. The best known natural deposit of ametrine is located in Bolivia. Ametrine is said to have positive effects on mood, metabolism, and the nervous system by bringing happiness and stimulating creative energy.