Emerald is the Modern and Traditional birthstone for May. It is also listed as a birthstone for the Zodiac signs for Taurus and Cancer, as the Planetary stone for Taurus and the Talismanic stone for Gemini. Emerald is the only stone, besides Topaz, that is listed as in all of the ancient birthstone tables.
Emeralds were used as amulets to ward off epilepsy in children and thought to cure diseases of the eye. Folklore suggests that these stones will improve memory, intelligence, and enhance clairvoyance thus helping to predict future events. They are also worn to enhance love and contentment.