Maybe an explanation of heat transmission would help. Stone tiles feel cold because they are a better conductor of heat than wood, textiles or rubber. The surface temperature is the same. So when you stand of them, more heat gets pulled out of the bottom of your feet and moves into the stone material, which needs a lot of heat to change its temperature by one degree.
So any 'stone' tiles that feel warmer must (IMHO) be some composite of stone and another material like rubber, or be the material that looks like stone but isn't. More than that, I don't know what this product might be.