It is a combination of both amethyst and citrine, hence the name ame-trine. Ametrine is found naturally and has not been heat treated or given other enhancements.
It is a highly sought-after precious Gem, which for centuries has been widely used in the creation and encrustation of jewellery and everyday items. Its Chemical Composition number is SiO2 (minor iron impurities cause ametrines colours.)
Ametrine gemstones are popular as beads as they have unique colour features from traditional amethyst colours to citrine colours so can create a unique effect on your jewelry pieces.