Definition
Mohs scale hardness 7
Several oxidation levels of iron inside the crystal give the zones visible in ametrine their distinct colors. The iron in the amethyst segments is not oxidized, but it is in the citrine segments. The distinct oxidation states develop as a result of the crystal's formation's temperature gradient.
Ametrine is a tectosilicate made of silicon dioxide (SiO2) and has a silicate framework that is connected by shared oxygen atoms.
The hydrothermal process is used to generate artificial ametrine, which is then crystallized by irradiating the finished product.
Low-cost ametrine could be made of synthetic substance. Ametrine that is green, yellow, or golden blue cannot be found in nature.
Origins
One of the most unusual and rare crystals, metrine crystals have only ever been found at the Anahi Mine in Bolivia, which is also famous for its enormous amethyst crystals. All ametrine crystals were only ever found in this one mine a few years ago.