It is a quartz stone with a combination of purple and yellow that has a hardness of 7 on the Mohs scale.
Amethyst is a two-color quartz (Bicolor).
The stone is composed of a violet amethyst and a yellow or golden citrine with a transparent quartz color stuck in a crystal.
The combination of popular stones such as amethyst and citrin in one stone has occasionally been used in the commercial marketplace for other names rather than amethyst.
Names like “amethyst – citrin”, “biocolor amethyst”, “bolivianite”, “biocolor quartz” and “trystine”
The Bolivianite name of ametrine, comes from the mines of Bolivia.