Moonstone Because this stone is so closely tied to the moon, this stone is used in many fertility symbols and rituals. It is also believed to help people get more in touch with the feminine side of their psyche. It is believed that if you put a moonstone under your pillow, it will help cure your insomnia. If you pair it under your pillow with amethyst, that will only increase the power. Additionally, the combination will make for purer dreams that will be easier to remember.