Diamond engraving or diamond-drag, also known as “scratch” engraving is used on metals such as brass, aluminum, stainless steel, pewter, silver ,gold as well as glass, stone, ceramic, granite and many other materials This process “scratches” any text or image onto the surface whether it be flat, curved or round. It is used for industrial and commercial applications, trophy engraving, gift engraving, pens, watches zippo lighters, flasks and many other items