Light and Joy are said to be transmitted through Druzy stones.  These are crystals with the power to dissipate negative thoughts and emotions, effectively radiating them away through many tiny points, like a radiator.
 
Crystals bring positive energy, hope, joy, good luck, and diffuse negative energy.
 
The colors in this beautiful creation inspire self-expression and the ability to communicate our needs and wants. It inspires higher ideals, and corresponds to the throat chakra.