Agate is associated with the Zodiac signs of Capricorn, Aquarius, Gemini, and Libra. It is the mystical birthstone for the month of September, and one of the birthstones for the months of May and June. Agate is also given as a gift for the 12th wedding anniversary. Agate is believed to bring protection to its wearer, increase courage and strength, relieve stress, balance emotions, alleviate insomnia, and bring about pleasant dreams. It is said to increase self-confidence, enhance concentration, improve memory, help with communication and public speaking, and fight addictions. It is reputed to foster honesty and trust. Blue agate is the state gemstone for Nebraska. Many states chose an agate to be their official state gemstone or rock, including Kentucky, Louisiana, Minnesota, Mississippi, Montana, Nebraska, Tennessee, South Dakota, and Washington State.