The project individuates criteria and information on the area of the marble or granite block containing defects. This will be achieved by implementing and validating relevant working procedures, capable of producing mapping images in terms of general location of defects and by setting up a data base containing ultrasonic information to be correlated with the technical characteristics of stone materials. The cutting criteria information is based upon the structural anomalies and inner defects acquired and elaborated by the project system. This result will help stone industries have a valid interpretation method and know exactly which area of a stone block contains defects. Stone manufacturers will be able to optimise the stone cutting phase and save production time, costs and waste production.