The 4 in Diamond Combination Sharpener features dual-sided coarse and fine diamond surfaces for restoring and refining edges on knives and tools. Multiple layers of micron-sized monocrystalline diamonds and an interrupted surface pattern improve sharpening efficiency by capturing metal filings during use. Integrated micro-tool pads and a sharpening groove allow detailed work on hooks and pointed tools. The detachable stone stores inside the handle for compact transport and protection.