Self Healed crystals are any variety of crystal where a part of the stone has at some time in the past broken off, or been damaged in some way, and it has healed back over.
They are characterized by small crystalline patterns on the healed end, rather than a rough cut, that you might see on normal stones that have been removed from the base rock.
Crystals with these configurations are well known as powerful aids to use for healing, especially self healing, and are known to aid the healing of broken bones.
They may teach you lessons about what issues you may need to work on in order to heal yourself. This is commonly related to emotional and spiritual healing, and they are also helpful to assist you to deal with past life trauma.