Moonstone is said in crystal healing to help calm responses and stress, and avoid overreaction. It brings hope, enhances feminine energies, sensitivity, intuition, and psychic abilities. It is also said to bring strong energies of abundance to one's life.
Moonstone is a stone of protection, especially during childbirth, pregnancy, and travel at sea. It is a stone of calm and relief from emotional stress. It is also associated with love of all kinds.
Physically moonstone is used in crystal healing to aid the pituitary gland and digestive system, obesity, water retention, hormonal problems, menstrual problems. Note that healing crystal meanings are spiritual supports to healing and are not prescriptions or healthcare information.
Moonstone is also used as a stand in for pearl, when pearl is not available. Moonstone is associated with the crown and third eye chakras, and sometimes with the heart chakra.