Ametrine is a transparent crystals that is composed of silicon dioxide and is a member of the Quartz group of minerals. Ametrine appeared on the market in the early 1980s, and at first many had doubts about it being a natural quartz variety and not some fancy artificial product.
The only known and well confirmed location for ametrine is an area in Bolivia near the Brazilian border.
There are similar specimens in India, and Brazil.
Ametrine crystals are made of alternating sectors of purple and yellow to an orange colour. Slabs cut perpendicular to the c axis of the crystal look a bit like a pinwheel with three sectors of purple and three sectors of yellow.
You may want to use it in specific situations where the energy of one of its corresponding chakras is either blocked or excessive in a way that relates to one of its other chakras.
The three chakras it rules are the solar plexus chakra, which rules ambition; the third eye chakra, which rules imagination; and the crown chakra, which rules spirituality.
If you feel like one of these chakras is sluggish, and needs some of the energy from one of the other three, place an ametrine stone against the blocked chakra and feel the energy from the healthy chakra pouring into the underactive one.