I think this was a medium piece I ordered - I really love it. The feeling from the rough is so lovely. My understanding is that stones this shade of blue usually resonate with the throat chakra but I tend to use it on my higher heart. It’s associations with water make sense as for me it’s the secure feeling of being enveloped by water…swimming in a warm sea, a relaxing bath, imagining yourself in the womb. So definitely warm energies that are deeply comforting. Perhaps it’s this safe space that helps open up the throat chakra as fears can be put to the side.