Amethysts forms in long, prismatic crystals in geodes or hollow rocks. These geodes form when there are cavities in volcanic rock. As the rock cools, the mineral-saturated water, gases and volcanic material distil and crystallize. When these crystals harden, they form amethyst. Although generally more of a deeper purple, the stone can also have a reddish-purple tinge, or a very pale purple tinge that fades into a lilac.
Natural amethyst has been used for personal adornment for at least 2000 years, while synthetic version is far newer, and not as common.
Natural amethyst stones are connected to the third eye and crown chakras. The purple color to reddish-purple hues of amethyst has long been a symbol of peace, cleansing and calming energy.