AMETHYST Headaches, Tranquilizing, Nightmares, Depression Amethyst is purple quartz, the traditional birthstone for February.It derives its name from the Greek word amethyst, meaning not drunk . The Greeks wore amethyst for protection against drunkenness, evil thoughts, magic and homesickness. Product Size : Weight : 70-90 gm | Stone Size – 6,8 mm| Shape Round | Number of Beads: 108+1 | Color : Purple | Material: Crystal .