It s clear why so many cultures have come to hold this stone in the highest respect. Amethyst the stone of february should also be worn on thursdays thor s day. Amethyst is a violet variety of quartz the name comes from the koine greek αμέθυστος amethystos from α a not and μεθύσκω ancient greek methysko μεθώ metho modern greek intoxicate a reference to the belief that the stone protected its owner from drunkenness.