Grit numbers are a sequence, not a single choice · review
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.
What we would actually buy Built like a tool rather than a kitchen accessory. For kitchen knives alone, the combination stones below do more for less.
A dual-grit diamond plate — 325 coarse at 45 micron and 1200 extra fine at 12 micron — of industrial monocrystalline diamond bonded to a 9 mm (0.35 in) steel base, with a non-slip storage base.
Grit numbers vary between manufacturers; micron sizes do not. Publishing both is the most precise specification in this hub.
Nine millimeters of steel. It does not flex under pressure and it does not dish, which is what separates a diamond plate from a water stone over years of use.
Anyone sharpening hard steel, carbide or garden tools as well as kitchen knives. For kitchen knives alone, the 1000/6000 combination stones in this hub give a finer finish for a fraction of the price.
On sale at around $70 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 | 325 coarse (45 micron) and 1200 extra fine (12 micron) |
|---|---|
| Abrasive | Industrial monocrystalline diamond |
| Substrate | Steel base, 0.9 cm (0.4 in) thick |
| Suitable for | High-speed steel, carbide and other hard materials |
| Base | Non-slip storage base |
| Amazon reference | B07GRWN1PV |
| EAN | 0814744028042 |
A listing is not an offer: the reference exists on these stores, availability changes daily.
It gives a working edge that cuts food perfectly. It does not polish, so the edge looks coarser than one finished on 6000 grit — which no tomato has ever noticed.
It removes metal quickly, so a soft European blade needs a light hand and few strokes. That is a technique adjustment rather than a warning.
8.7/ 10
Built like a tool rather than a kitchen accessory. For kitchen knives alone, the combination stones below do more for less.
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 |
|---|---|---|
| SHARPAL Diamond 325/1200 with storage base | $70 | 325 coarse (45 micron) and 1200 extra fine (12 micron) |
| 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 |
A workshop as much as a kitchen, and any blade a conventional stone struggles with.
Amazon reports what buyers took in the month before this page was last checked: at least 1,000.
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
Three sides · 400 diamond, 1000, 8000 ceramic · angle guide · no soaking
A three-sided block combining a diamond coarse face with ceramic finer faces — diamond cuts hard steel fast, and none of it needs soaking.
Best for: Hard Japanese blades, and anyone who will not soak a stone.
≈ $39
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.
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
