February's birthstone is the amethyst.   Amethyst  (from the Greek "amethystos") means "not drunk", so its wearers thought it prevented intoxication.   It has been used as a healing aid to dispel sleep, sharpen intellect, and protect the wearer from sorcery.  It brings victory in battle and protects from bad dreams, baldness, bad skin,  and gout.  It is also said to be the stone of Saint Valentine, who wore an amethyst engraved with the figure of his assistant, Cupid.   The amethyst was the stone of royalty, representing power and is associated with sincerity, sobriety, tranquility, protection and peace.  The Amethyst is thought to bring stability, strength, peace, healing, intelligence, and inspiration to its possessors.