When a knife's edge becomes dull, you can reset the edge with a diamond steel or ceramic steel. The difference between a diamond steel or ceramic steel and honing steel, is that a diamond steel and ceramic steel will actually grind away material from the knife, allowing it to reset the edge. A ceramic sharpening steel, much like a diamond sharpening steel, will reset the edge of a dull knife. Ceramic sharpening steels are slightly less abrasive and will gently sharpen knives in comparison to a diamond sharpening steel resulting in a finer edge. Ceramic knives are offered in two different grits, 300 or 1,000. Although ceramic is harder than steel, it is brittle and will break if it is dropped.