Ametrine is a variety of quartz consisting of both amethyst and citrine, portraying both purple and yellow hues.
These two varieties of quartz are each colored by the element iron, and the amount of heat during growth determines whether a gem will be amethyst or citrine. In this case, we get both, since one mineral crystal was exposed to heat variation during its formation.
Most naturally occurring ametrine comes from Bolivia, with some from India and Brazil. Cutter's will orient these stones with enthusiasm trying to display their unique color banding, often cutting so that the gem will be half purple and half golden.
CARING FOR AMETRINE
Since ametrine is a variety of quartz, it is considered a hard and durable stone. It can be cleaned with a soft brush in warm soapy water or wiped clean with a cloth. When stored, it should be wrapped to prevent it from scratching softer stones or it being scratched by harder stones. Avoid harsh chemicals when wearing this stone or any kind of jewelry.