Amethyste

Amethyste or Amethystos is supposedly a nymph in Greek mythology who was turned into a precious stone by the goddess Diana/Artemis in order to avoid a worse fate at the hands of the god Dionysus, thus explaining the origin of the semi-precious stone amethyst. Although this tale has circulated in various sites and books, no ancient source attests to it, and its origin is much later than either ancient Greece or Rome.