You will find both natural and synthetic varieties of green amethyst, so be careful as you buy green amethyst jewelry – the synthetic varieties are mostly created through heat treatment. The color of this stone can range from yellowish green to pale green, and it is a type of macrocrystalline quartz, meaning the quartz crystals that make up green amethyst are large enough to be seen with the naked eye. Let us discuss green amethyst in great detail, starting with green amethyst history.