Throughout many traditions the sun represents the father and male principle and the moon the mother and feminine principle. The energy of the moon is intuitive, deep, subtle, feminine and psychic. To say this is a feminine energy does not mean to say this energy is just for women. Men and women have their female and male aspects. We all develop them both.
The moon is also associated with clairvoyance and knowing without thinking. To use the energy of the moon does not involve conscious thought. So to wear or have around you the symbol of the moon is to state your universal intention to use your intuition, to simply go with what you feel and to know that to do this is for your greater good.
The moon has different phases and throughout these phases it affects us in different ways. For example the full moon represents illumination, unconscious made conscious and all can be seen. The crescent moon symbolises new beginnings and the making of dreams into reality. Because of this cyclic nature the moon it is also connected to rebirth and how our true essence really is immortal.