Usually it's a question of colour, tonal variation and markings. For a more formal room such as a hallway or conservatory you may not want a strongly-coloured stone; choose a more neutral one such as Atlas or Piedra Plana Extra (PPX), a versatile off-white limestone. For a kitchen with a lot of daylight, you may want to choose one of the darker stones such as the characterful Acero greeny-grey limestone or our mid-grey flecked Italian Basalt.