I normally shy away from recommending vendors, but cannot resist highlighting this on-line rock seller. Inner Vision Crystals. They reminded me of another entity: Heaven & Earth, from which I sourced for my Moldavite pieces many years ago.
And, the stone which they advertise – Brandberg Amethyst, also known as Vera Cruz Amethyst an excellent stone normally in the natural formation of laser termination. The stone has excellent refine energy vibration and stirs both the Third Eye and Crown chakra when you first touch it.