Evidence of diamond growth was observed on a type II-A single crystal diamond in the "hydrothermal" pressure-temperature regime (1.4 kbars at 800 degrees C) in which both NaOH and Ni were added. The features seen in the SEM appear to be randomly oriented overgrowths ranging in size from 2-5 mu m on the surface of a single crystal diamond. The Raman spectrum with the beam focused on these overgrown crystallites showed a sharp band at 1331 cm(-1), providing further evidence of diamond growth on a single crystal diamond under pressure-temperature hydrothermal conditions.