My mom loved the stones. She had, like you, almost every stone. I think when she bought them, she would leave them that night in the serene, to recharge with the energy of the night and the moon. Likewise, when the stones absorbed the bad energies, I would wash them with filtered water and a little coarse salt and leave them on that night on the garden table. They became beautiful again. Amethyst is for transmuting negative energy into positive, right? Apart, of course, from the fact that it serves to relax, calm down and reduce anxiety. The mug fascinated me and your stones are beautiful.