An amulet is a small object thought to bring good luck, and can be imbued with powerful protective enchantments fo shield the wearer from Dark Magic. Gilderoy Lockhart claimed to have dealt with Transmogrifian Torture in Ouagadougou by giving townsfolk protective amulets, though this were most likely the a feat accomplished by one of the more skilful wizards whose acts of selfless bravery Lockhart had taken credit.
In 1992, a booming trade in protective amulets started in Hogwarts School of Witchcraft and Wizardry because of Salazar Slytherin's monster. Neville Longbottom purchased a pointed purple crystal, a newt tail, and an "evil-smelling green onion" that may have been a gurdyroot before it was pointed out to him that he was Pure-blood and therefore unlikely to be in danger. His response to this was that the monster went after Filch (through his cat) first, and everyone knew that he was a Squib. Later, when Voldemort returned, sales of protective amulets from dark creatures started up in Diagon Alley stalls.
In 1996, a peddler attempted to sell Ginny Weasley one of these amulets, which his signage claimed were effective against werewolves, Dementors and Inferi, but he was not successful because her husband, who was the current Head of the Office for the Detection and Confiscation of Counterfeit Defensive Spells and Protective Objects, was together and threatened to arrest the dealer if he was on duty.
Parts used to in the manufacture of amulets include: