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Amethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, iron impurities (in some cases in conjunction with transition element impurities), and the presence of trace elements, which result in complex crystal lattice substitutions.
The ametrine gemstones comes into being when both amethyst and citrine occur in the same quartz crystal, and in proximity to each other, to give the effect of two colors. Chemical Composition of Ametrine Gemstone. Its formula is represented as SiO2, and its color is the result of iron impurities.