Not even cross in my mind there is someone can think such unique idea to design the bathtub with the stone as the material. Can't imagine how it might feel if I try it. But it will never be a bad idea to try, or maybe bad idea not to? What do you say? I have my own opinion with this. I think if we have this natural stone bathtub in warm air of tropical climates, then the stone will naturally cooling the water. Anyone can tell me how it will be in the low temperature of the four season country? ...Bathroom.