The Kyokuha Series of NSK Diamond Stones is the original series that has been in production for years. Relative to the other offerings in their catalogue, these are slightly softer, and offer a little more feedback during sharpening. This makes them an especially excellent choice for newer sharpeners, or sharpeners just getting into diamond stones. But even with them being relatively softer, the Kyokuha Series still exemplifies everything that is great about NSK Diamond Stones; they cut very fast, their grit accuracy and grit consistency is superb, and they work well for all ranges of steels and hardness.

Across all the grit ranges available, the Kyokuha Diamond Stones don’t produce mud during sharpening, making it easier to keep track of the progress of work you’re doing. Additionally, each stone comes with a ‘resurfacing wafer’, meant to be used after flattening to return the surface of your diamond stone to optimal.

Available Grits:

#200 - #500: Used to reset bevels, aggressive thinning, and cleaning up chips and damage to blades.

#600 - #1000: Used to progress geometry established by the previous grit range. All used to maintain a blade between full progressions. Fast enough to fix minor chips that might normally require a 400 grit stone from a standard synthetic line.

#1500 - #3000: Used to further refine geometry, or for setting up a blade to move to Natural Stones for a final polish. With excellent technique, a blade’s surface can go straight from #3000 grit to Koma Nagura. Also good for final edge work; produces a refined edge that still has great bite.