For your consideration are these rainbow Clear Quartz crystal spheres, sold by the piece. These are all super gemmy and guaranteed to have intense internal rainbows. They measures approximately 22-24mmm in diameter.
Clear quartz is known as the Stone of Power. Produces harmony of the body and mind, allowing one to think more clearly an act effectively. Increases physical and mental energy, perseverance, and patience re-directs negative energy to a positive state. Enables one to laugh and love more easily. Amplifies the energy of other stones, as well as amplifies the energy of intention.
Chakra: Third Eye