The two main types of diamond knife sharpeners are continuous diamond surface sharpeners and sharpeners that have holes in the surface that capture the filings. Both of these sharpeners are also available in mono- and poly-crystalline diamond options.
Diamond sharpeners are advantageous because they provide very fast sharpening. Not only do they sharpen knives quickly and efficiently, but they are also long-lasting, which makes them a desirable option in busy workshops and kitchens. These sharpeners are so effective that they are sometimes used to create the sharpening surface on other stone sharpeners. However, diamond sharpeners may be expensive compared to other knife-sharpening options.