Crystal healing uses of crystals to bring about healing and positive changes in the mind and body.
It is a healing technique for strengthening the body - mind and soul and resolving issues and patterns using various forms of natural crystals.
The theory is that gemstones carry a vibration. By placing these gemstones within the aura - your aura's vibration may change for the better.
Crystals and their healing properties
For crystal healing, quartz is the most common used crystal. It comes in many kinds, colors, shapes and sizse, among which are amethyst, citrine, clear quartz, snow quartz, smokey quartz, etc.
For more info see Vibrational Healing