United States
Monocrystalline diamond, and an angle you can set
Two sharpening tools, and both publish what a sharpening tool should.
Seven pieces, adjustable from 10° to 35°, with monocrystalline diamond plates at 220, 325, 600 and 1000. A published angle range is the whole argument for a guided system: it lets a 15° Japanese edge and a 20° European one be sharpened on the same jig.
Dual grit at 325/1200, monocrystalline diamond on a 0.9 cm (0.4 in) steel base with a non-slip storage base.
A diamond plate must stay flat. Bonded to 9 mm (0.35 in) of steel it does; on a thin substrate it can bow, and a bowed plate puts a curve in an edge that no amount of technique removes.
The 325/1200 plate. Diamond cuts hard modern steels that a natural or ceramic stone struggles with, and it never needs flattening.
Dual grit 325/1200 · monocrystalline diamond on a 0.9 cm (0.4 in) steel base · non-slip storage base
The top of this hub: industrial monocrystalline diamond bonded to a 9 mm (0.35 in) steel plate, in two grits, with a storage base — built to sharpen anything hard.
Best for: A workshop as much as a kitchen, and any blade a conventional stone struggles with.
≈ $70
Adjustable 10° to 35° · 7-piece set · monocrystalline diamond plates 220/325/600/1000 · whetstone included
A guided system with a genuinely adjustable angle from 10° to 35°, four diamond plates and a whetstone — the only sharpener here that can match a Japanese 15° edge.
Best for: Someone with Japanese knives who wants repeatable results without freehand practice.
≈ $180
