# Best Diamond Sharpening Stones and Plates for Knives Source: https://stoneandstrop.com/best/best-diamond-sharpening-stone Publisher: Stone and Strop. Picks are chosen from what each Amazon listing states, not from hands-on tests. Method: https://stoneandstrop.com/how-we-pick A diamond plate is the sharpening stone for anyone who does not want to soak or flatten: it is used dry or with water and it stays flat. What differs between plates is the grit pair, whether the listing backs the grit with a micron size, the plate size, the type of diamond, and what holds the plate still. For knives, buy the sharpening grit first: about 25 down to 9 micron, which these listings label 600 to 1200. A coarse side of about 45 micron (325) is for chips and for changing the angle, so a double-sided coarse and extra-fine plate covers both jobs in one purchase. Grit numbers are not one scale: 1200 is 12 micron on one plate here and 9 micron on another, so compare microns where they are printed. An 8 x 3 inch plate gives a long kitchen knife room to travel. Monocrystalline diamond is named in four of these listings; none says polycrystalline, and the rest say only diamond. This guide compares seven diamond sharpening stones and sets. Everything comes from the listings; nothing here was tested. ## Picks ### 1. SHARPAL 162N Double-sided Diamond Sharpening Stone, 8 in. x 3 in. Grit: 325 / 1200 grit; Micron: 45 / 12; Plate size: 8 x 3 in; Base or case: Storage box, non-slip pad A double-sided 8 x 3 inch plate: coarse 325 grit (45 micron) and extra fine 1200 grit (12 micron) monocrystalline diamond on a 0.35 inch stainless steel base. The storage box doubles as a stone base. What the listing offers: - Both sides carry a micron size: coarse 325 grit is 45 micron, extra fine 1200 grit is 12 micron. - Monocrystalline diamond electroplated on a stainless steel base 0.35 inch thick; the listing says to sharpen dry. - The storage box with a non-slip rubber pad works as the base, and an angle guide for 14, 17, 20 and 25 degrees is included. Limits to know: - Nothing finer than the 1200 grit (12 micron) side: polishing beyond that needs a strop or a finer stone. - The angle guide offers four fixed angles only, and the listing gives no weight for the plate. ### 2. SHARPAL 168H Large 8" x 3" Dual-Grit Diamond Sharpening Stone Grit: 325 / 1000 grit; Micron: 45 / 15; Plate size: 8 x 3 in (201 x 75 mm); Base or case: not stated An 8 x 3 inch double-sided plate with coarse 325 grit (45 micron) and extra-fine 1000 grit (15 micron) monocrystalline diamond. The listing mentions no box, base or angle guide. What the listing offers: - Micron sizes are stated for both sides: 325 grit is 45 micron and 1000 grit is 15 micron. - 8 x 3 inch (201 x 75 mm) surface, which the listing says supports larger tools and better angle control. - Monocrystalline diamond; the listing says the plate stays flat, needs no lapping and works dry. Limits to know: - No storage box, base or non-slip pad is mentioned in the listing. - The plate thickness and weight are not stated in the listing. ### 3. DMT Deluxe Diamond Professional Knife Sharpening Kit - Includes Set of 3 Diamond Whetstone Blocks for Kitchen Knives, Lawn Mower Blades, Hunting/Butchery Tools, and More - Comes in Natural Wood Box Grit: 325 / 600 / 1200 mesh; Micron: 45 / 25 / 9; Plate size: not stated; Base or case: Wood box Three separate DMT diamond whetstones in a wood box: blue coarse (45 micron / 325 mesh), red fine (25 micron / 600 mesh) and green extra-fine (9 micron / 1200 mesh). A three-step progression with every size printed. What the listing offers: - Each stone is color coded and sized in microns: coarse 45, fine 25 and extra-fine 9. - Micronized monocrystalline diamond, and the listing says the stones are made in the USA. - Three stones housed in a wood box, covering restoring, honing and refining an edge. Limits to know: - The listing bullets do not state the length or width of the stones. - Three single-grit stones take more room than one double-sided plate, and no non-slip base or holder is mentioned. ### 4. Double-sided Diamond Sharpening Stone,Knife Sharpening Stone with Extra Fine 1200/Coarse 400 Grit Diamond Plate, Storage Case with Non-Slip Base & Angle Guide(7 x 3.5 Inch) Grit: 400 / 1200 grit; Micron: not stated; Plate size: 7 x 3.5 in; Base or case: Case, non-slip pad A double-sided honeycomb diamond plate, coarse 400 and extra fine 1200 grit, sold with a storage case, dust cover, non-slip rubber pad and an angle guide. The title gives 7 x 3.5 inches. What the listing offers: - Coarse 400 and extra fine 1200 grit on one plate, with a honeycomb surface that the listing says keeps grinding dust out of the way. - Comes with a storage case, dust cover and non-slip rubber pad, plus a sharpening angle guide. - The listing says it can be used dry, without oil or water, and should be kept dry after use to prevent rust. Limits to know: - No micron sizes, and the listing does not state the type of diamond used. - The title's 7 x 3.5 inches is not split into plate and case, so the abrasive area is unclear; the listing warns about rust. ### 5. Ultra Sharp Diamond Sharpening Stone Set - 8 x 3 Coarse/Medium/Extra Fine Grit: 300 / 600 / 1200 grit; Micron: not stated; Plate size: 8 x 3 in each; Base or case: Stone holder Three 8 x 3 inch diamond stones in 300, 600 and 1200 grit with a stone holder that takes stones 6 to 9 inches long. Each stone weighs 2.2 pounds, per the listing. What the listing offers: - Three full-size 8 x 3 inch stones in 300, 600 and 1200 grit. - A stone holder is included; the listing says it holds stones from 6 to 9 inches long. - Each stone weighs 2.2 pounds, and the listing names ceramic knives among what it sharpens. Limits to know: - No micron sizes are given, so the grit numbers cannot be checked against other makers. - The listing does not say whether the diamond is monocrystalline or polycrystalline, and no storage case is mentioned. ### 6. S SATC Diamond Sharpening Stone 2 Side Grit 400/1000 Diamond Plate Honing Stone 8-inch Hone Sharpener White Grit: 400 / 1000 grit; Micron: not stated; Plate size: 8 in long; Base or case: not stated A double-sided 8 inch diamond plate, 400 grit on one side and 1000 on the other, on a machined steel plate electroplated with monocrystalline diamond. A plain plate with no base in the listing. What the listing offers: - Two grits on one plate: 400 for coarse work and 1000 for fine work. - Steel plate machined and electroplated with monocrystalline diamond, per the listing. - The listing notes that diamond plates do not crater and do not need to be flattened. Limits to know: - No micron sizes, and the width and thickness of the plate are not stated. - No base, case or non-slip pad is mentioned; the uses named are straight edged tools such as chisels and planer blades. ### 7. Grindance 3-Sided 400/1000/8000 Grit Diamond Sharpening Whetstone Kit Grit: 400 / 1000 / 8000; Micron: not stated; Plate size: not stated; Base or case: Plastic non-slip base A three-sided block on a plastic base: 400 and 1000 grit diamond sides plus an 8000 grit ceramic side for polishing. The kit adds a 14/17/20 degree angle guide, a leather strop and a cut-resistant glove. What the listing offers: - Three surfaces in one tool: #400 diamond, #1000 diamond and #8000 ceramic. - Plastic base with anti-slip pads holds the stone on a countertop or workbench. - Kit includes a 3-in-1 angle guide (14, 17 and 20 degrees), a leather strop and a cut-resistant glove. Limits to know: - The 8000 side is ceramic, not diamond, so only two of the three sides are diamond. - No stone dimensions, micron sizes or diamond type are stated; the listing only calls it compact. As an Amazon Associate I earn from qualifying purchases.