Diamond burnishing tools are a special variety of burnishing tools used to finish heat treated jobs with hardness upto 65HRc. In diamond burnishing process the job material is cut and not rolled. The depth of cut will be in the order of few microns only. Hence the change in the diameter is negligible. Lower surface finish is achieved in the hardened and ground jobs. These tools can also be used in ferrous and non-ferrous material in soft stage. Both external diameter and internal diameter can be burnished with diamond burnishing tools.