They can strengthen your ability to be a loving person, and can enhance your abilities to enjoy life and accomplish the things you want in life. They can amplify intention, reduce stress, help with centering, balancing or calming, strengthen healing abilities, and surround you with protection by amplifying white light.
Any healthy quartz crystal point can strengthen these things and help produce personal growth by amplifying the subtle energies that flow inside you.
Crystals come in all shapes, from tumbled stones and cut crustals to natural formations like clusters, wands, and phantoms. In fact, a crystal's shape may determine its metaphysical function.
These crystals strongly amplify the feminine energy, and can help you get in touch with the 'female' or unselfish side of yourself, no matter whether you are a man or a woman. These crystals are useful in balancing your male-female energy if the female energy has been suppressed, or if you need a greater balance of female energy for any reason. Cerridwen crystals put you in touch with the power of the Goddess.
For men, the Cerridwen crystal will help you become more in tune with your feminine side and to become more aware of the aspects of women that you may find troubling. For women, the Cerridwen crystal will help you regain some of the power and energy that society has taken from you. Teaches that feminine is not weak.
Anyone doing healing work with another person will find the Cerridwen energy to be effective. The Cerridwen crystal should be carried or held when dealing with issues that are emotional and difficult.
To nurture yourself, sit with the Cerridwen crystal in your hand with the point directed toward you. Visualize white light going from the point of the crystal and surrounding you. After doing this you should feel strong and cared for.
Sources: Crystals For Beginners and Wicca Sources