Consumer Reports

What we like: Effective sharpening, fine stone provides an exceptionally sharp edge.

What we don't like: Slight learning curve, you may need to purchase a separate, coarser stone to repair knives that are damaged or very dull before this stone will put on an edge.

For the avid cook, there are few more valuable tools than a solid and dependable knife—and taking optimal care of one is of utmost importance. This double-sided sharpening stone comes with both a coarse and a fine side, which provides exceptional sharpening and an exceptionally sharp edge via the fine side. CR editor Paul Hope found that the Sharp Pebble Whetstone put an edge on the knives that none of the electric or manual sharpeners could match, making it a top choice for cooks who are serious about sharp blades.For more options: Best Knife Sharpeners 

Whetstone Comparison