8mm. Amethyst Power bead bracelet, power beads, buddha beads. Current shipment is light purple to lavender all around healing stone. Intelligence and brain power. Amethyst is a variety of quartz, it differs from ordinary quartz crystal because of its purple color. The purple color is due to traces of manganese or iron. Amethyst can be found in Brazil, Uruguay, India and Sri Lanka. Large amethyst geodes are most commonly found in southern Brazil.