Grit numbers are a sequence, not a single choice · review
A three-sided block combining a diamond coarse face with ceramic finer faces — diamond cuts hard steel fast, and none of it needs soaking.
What we would actually buy Diamond is the right abrasive for hard steel, and no soaking removes the main reason stones stay in a cupboard.
A three-sided sharpening block: a 400 grit diamond face for repairs, and 1000 and 8000 ceramic faces for sharpening and polishing, with an angle guide and no soaking required.
Hard Japanese steels — anything stated at 60 HRC or above — are slow going on a conventional corundum stone. Diamond cuts them at a sensible rate, and it does not dish.
The practical advantage. A stone that needs ten minutes of preparation gets used less often than one that does not, and sharpening is a habit before it is a skill.
Dimensions. On a three-sided block the working face is narrower than a flat stone, which makes long blades slightly more awkward.
On sale at around $39 on the American Amazon store at the time of checking.
Prices and availability are what Keepa reported on the date this page was updated; both move.
Prices quoted in this text were read on 3 September 2026. The live price is at the top of the page.
| Grits | 400 diamond, 1000, 8000 |
|---|---|
| Materials | Diamond coarse face, ceramic finer faces |
| Included | Angle guide |
| Design | Three-sided, stated for repairs through to polishing |
| Use | Kitchen knives and outdoor tools |
| Amazon reference | B0CNGK34KZ |
| EAN | 0788362611446 |
A listing is not an offer: the reference exists on these stores, availability changes daily.
Diamond cuts hard steel faster and does not dish. On a blade stated at 60 HRC or above, a corundum stone is slow; a diamond plate is not.
They lose their initial bite as the exposed diamond wears, then settle to a steadier cutting rate. They do not dish, which is their main advantage over water stones.
8.1/ 10
Diamond is the right abrasive for hard steel, and no soaking removes the main reason stones stay in a cupboard.
Close prices, same category: comparable cookware and knives. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Grits |
|---|---|---|
| DOWOX 3-sided diamond and ceramic, 400/1000/8000 | $39 | 400 diamond, 1000, 8000 |
| Amazon Basics 1000/6000 double-sided | $28 | 1000 on one side, 6000 on the other |
| wucgea 400/1000 + 3000/8000 set | $22 | 400/1000 and 3000/8000 — two double-sided stones |
| SHARPAL Diamond 325/1200 with storage base | $70 | 325 coarse (45 micron) and 1200 extra fine (12 micron) |
Hard Japanese blades, and anyone who will not soak a stone.
Amazon reports what buyers took in the month before this page was last checked: at least 50.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for cookware and kitchen knives and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Double-sided 1000/6000 grit · angle guide included · non-slip bamboo base
The combination stone that covers a home kitchen — 1000 to sharpen, 6000 to refine — with an angle guide and a bamboo base, at the lowest price here.
Best for: A first stone, for knives that are dull but undamaged.
≈ $28
Two stones 17.8 × 5.6 × 2.8 cm (7 × 2.2 × 1.1 in) · four grits · bamboo base with rubber feet · FLATTENING STONE INCLUDED
The only stone set here that includes a flattening stone — the consumable nobody anticipates — with published dimensions and a bamboo base.
Best for: Someone who intends to keep sharpening for years rather than once.
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
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
