Malachite is typically found in the Czech Republic and Bohemia. It is toxic and should not be put in the mouth and should be kept away from children. The beads are wire wrapped with tarnish resistant craft wire and accented with gold Vermeil beads. The chain is 4mm gold vermeil from "Inch of Gold" a company that has been in business since 1982. The chain comes with a lifetime guarantee . (see picture included with purchase). It is available in sizes 8-11, please utilize customization for size choice. To determine proper size measure ankle just below ankle bone and add 1/2 inch. Your anklet will arrive in a lovely gift box.