Amethyst stone is a purple-colored, semiprecious gem of the quartz mineral family. It is known as katela or jamunia in the Hindi language. It is a substitute for neelam stone and people use it to protect themselves from the evil effects of Saturn. This stone is considered extremely important in reducing the effects of alcoholism. This stone is also known as amethystos in Greek, which means “not to be drunk” (a- “not” and methyein- “to be drunk”). It’s a February birthstone.