There are many different sauna stones available. We recommend to used only proper sauna stones that are supposed to be placed on a sauna heater. For electrical sauna heaters we recommend smaller stones (Ø 5–10 cm) and for wood-burning sauna stoves we recommend bigger stones (Ø 10–15 cm). The stone type can be either olivine diabase (the most common sauna stone) or vulcanite, which has a bit darker tone. Ceramic stones we recommend only for Aitokiuas stoves, where the fire is in direct contact with the stones. Rounded and white sauna stones are for decorative purpose only, and the top layer can be of those types.