This is a bi-color variety of quartz contining both amethyst and citrine colors. The stone is usually cut in facets in a rectangular shape to show both the yellow and purple colors. The Anahi Mine in Bolivia is the major source for ametrine.
A gemstone that is composed of part Amethyst and part Citrine. Natural Ametrine usually occurs where Amethyst has come in contact with heat, which changes the color from purple to golden yellow, but may also be created in a lab.
Ametrine is a variety of quartz, a mixture of amethyst and citrine. Ametrine is partially purple and partially orange-yellow.