Crystal Healing

[BrownEye]

You know what, in Book V, Personal Material, Ra answered a question confirming that a crystal given to Carla would be of beneficial use, as long as the giver was still on the positive path (a guy named Neal).
A bond, through a crystal, from giver to receiver? interesting

A crystal can have "character" and refuse to work in the hands of a particular individual. If the individual were to change, the crystal may change its view of the individual.