For your consideration are these beautiful Clear Quartz pyramids. They measure approximately 25-30mm and are sold by the piece.
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