About Stone Reliefs, Etching : Relief is a sculptural technique in which sculpted natural stone remains attached to a solid background made of the same stone material. To make a sculpture in relief is to give the feeling that the carved stone material rises above the background plane. CNC machines can do great engraving wall relief work in a very short time. In addition, using the latest advanced laser technology, the machines create unique personalized and photo-engraved gifts, plaques and memorial stones.