Which gemstone was believed to protect its wearer from drunkenness?

The ancient Greeks believed that amethyst was a very strong antidote against drunkenness. They would wear jewelry decorated with the stone and drink from goblets carved out of large crystals in a bid to protect themselves from intoxication. There are several myths and legends that all have variations on the theme of amethyst gaining its color from the wine of the gods (in one story Bacchus himself pours wine over a white stone), both leading to the creation of amethyst. The stone, therefore, had an association with the power and protection of the gods.