The Eye of Horus.
A talisman is a charm, amulet or other ornament that has a magical meaning to the wearer. It could ward off evil, disease or warrant good luck to the wearer. Often special attributes were assigned to gemstones and different stones were believed to protect only in certain months, related to the zodiac signs. Birthstones are derived from this common practice in medieval times, although the use of talismans is from all ages.