In terms of healing, crystal pendulums can be used for unblocking chakras energies.
As the pendulum acts as an amplifier for the energy to flow fluidly throughout the body, it provides good information in determining your chakra for your decision-making process.
 
Pendulums are used for dowsing and divination – mystical practices in which one asks the universe for divine guidance through the movement of the pendulum.
Pendulums tap into the energetic connection between you, the Earth, and the Cosmos.
 
Amethyst
The all healer crytasl of people, animals and plants. A very high vibratory stone, is has been used for centuries for its protective and spiritual qualities. Amethyst stimulates and then calms the throat and the heart chakra. 
An excellent cleanser for the blood, balances de physical, mental and emotional bodies-linking them to the spiritual body.