Generally speaking, our katana is already sharpen. But when you made the purchase, for some reason, you chose not to sharpen it. If you want to sharpen it yourself later, we will provide the following simple sharpening methods. There are 4 main steps to sharpening a Katana: Shaping work using an uchigumori stone to remove rust and scratches. The blade is then passed over progressively smaller and finer stones in an effort to remove the marks from the uchigumori stone. Hazuya stones glued to traditional Japanese paper are then used in order to remove the microscopic scratches that are left from the previous polishing. Finally a Jizuya stone is used and rubbed on the surface of the blade, this is a long process done until the stone wears out.