As many whiskey drinkers agree, the best way to enjoy whiskey is with a bit of ice to help bring out the complex notes and aromas, making whiskey stones quite useless at the bar.
Along with coffee, these stones are perfect for cooling down other hot beverages you don't want to be diluted, like tea and cocoa, since they are designed not to absorb moisture.
Just remember that whiskey stones are meant to be stored in the freezer in order to achieve their chilling ability. So put them next to your ice cube tray for your next hot drink.