Is a quartz crystal variety, so like all quartz, is a strong amplifier of energy. They have within them the vibration of Citrine crystals, which is the energy of the Solar Plexus chakra, as well as using the Amethyst vibration within it. Ametrine crystals provide a connection between the higher energies of the crown chakra and the energy of the physical, from the solar plexus chakra. It is said to enhance mental and spiritual clarity.
Crown, solar plexus chakras