Amethysts usually form in the most natural surroundings under intense heat and pressure. They generally occur in long prismatic crystals in geodes and hollow rocks. These geodes form when there is cavities in volcanic rock and when mineral-saturated water fills, it takes the place of a crystal. These crystals gradually harden and result in our Amethyst. Natural Amethyst Crystals are a member of quartz crystals, and since they form naturally, their tones vary with each stone. From intense reddish-purple color to pale purple that fades to lilac shades, it is a delight to watch this gem in every manner.