Since purple is considered to be one of the royal colors, amethyst has a historical importance as an insignia of power. Purple amethyst is natural and requires no heating.
Amethyst is a purple color, some deep purple to light purple and violet. Lavender is a light purple colored amethyst. Green is something known by gemologists as prasiolite a result of heating.Commercially it is called green amethyst.
The largest deposits of Amethyst are in Brazil,Bolivia,Canada and Uruguay.