We Make Fire…Better. Revolutionary indoor and outdoor modular refractory fireplaces. Made from the cleanest, purest pumice, sourced exclusively in Iceland, Earthcore’s Isokern® masonry components cradle the raw power of fire in the safest, most energy-efficient material on earth. Totally customizable, Isokern allows architects to pursue their most inspired designs. While connecting the homeowner with the natural beauty of fire in a way that, until now, only nature could.