Transparent, bicolored quartz with the colours of both amethyst and citrine in the same gem is called ametrine or amethyst-citrine. The contrasting colours give it an intriguing appearance.

The world’s only commercial source of ametrine is the Anahi mine in southeastern Bolivia. Legend has it that a Spanish conquistador discovered the mine’s location in the 1600s and introduced the gem to Europeans when he presented several specimens to his queen. The mine had been given to him as a dowry when he married a native princess named Anahi. After that, the mine was lost for more than three centuries. Rediscovered in the 1960s, the mine’s ametrine began appearing on the market again during the 1970s. Today the mine, named Anahi for the legendary princess, also produces natural amethyst and citrine.

SOURCES:

“Ametrine Description.” Gemological Institute Of America, www.gia.edu/ametrine-description.