Ametrine is quartz that is part amethyst and part citrine: purple and yellow zones in one crystal.
In more detail
Most natural ametrine comes from Bolivia. Laboratory-grown ametrine also exists.
Related terms
- Amethyst: Amethyst is the purple variety of quartz. Iron in the crystal, together with natural radiation, causes its color.
- Citrine: Citrine is the pale yellow to brownish orange variety of quartz.
- Quartz: Quartz is the mineral species of amethyst and citrine. It is silicon dioxide in a trigonal crystal.
- Color zoning: Color zoning is uneven color in a gem: bands or patches of deeper and paler color.