"collection of potent amethysts"

Amethyst is a violet-coloured stone often used in jewellery. The name is derived from the Ancient Greek ('not') and μέθυστος methustos ('intoxicated'). In Ancient Greece and Rome people wore amethyst and made drinking vessels from it because they believed amethyst protected against intoxication. In medieval Europe soldiers wore amulets made of amethysts in battle because they believed amethyst had healing properties.

Read about amethyst in ancient mythology.