Metaphysically, its monoclinic structure makes kunzite protective and expansive. Expansive crystals are good to work with when you need to facilitate personal growth, and kunzite can help you grow emotionally. It can also help you protect your emotions, so it's a good crystal to carry with you when you're feeling emotionally unsteady.
Pink kunzite is a stone both of the heart and the head. It can help bring negative thoughts into your heart center to help begin to heal them. It can also help you grow and expand love energy in your life.
Violet kunzite supports the expansion of intuitive or psychic energies as well as providing psychic protection. Green kunzite is similar to pink in that it supports both the mind energy and heart energy. Yellow kunzite strengthens self-esteem and can protect you against negative thoughts you have about yourself as well as negative self-talk.