3mm amethyst beads, 2mm 925 sliver beads. Amethyst is a gemstone with a very long history. Ancient greek believed that amethyst can prevent them from drunk, and in Judaism, it is believed that amethyst could help make powerful dreams. It is also a royal colour in British culture which amethyst is usually associated with the royal family. Amethyst is related to the crown chakra, it might helps a person's spirit and consciousness.