---
product_id: 6003235
title: "Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack"
brand: "dmt (diamond machining technology)"
price: "432 kr"
currency: DKK
in_stock: true
reviews_count: 8
category: "Dmt (Diamond Machining Technology)"
url: https://www.desertcart.dk/products/6003235-diamond-machining-technology-dmt-dia-sharp-diamond-sharpening-stone-credit
store_origin: DK
region: Denmark
---

# Color-coded grit for easy ID Credit card-sized, pocket-ready Micronized monocrystalline diamond surface Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack

**Brand:** dmt (diamond machining technology)
**Price:** 432 kr
**Availability:** ✅ In Stock

## Summary

> 💼 Sharpen like a pro, anywhere you go — your edge, your power.

## Quick Answers

- **What is this?** Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack by dmt (diamond machining technology)
- **How much does it cost?** 432 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/6003235-diamond-machining-technology-dmt-dia-sharp-diamond-sharpening-stone-credit)

## Best For

- dmt (diamond machining technology) enthusiasts

## Why This Product

- Trusted dmt (diamond machining technology) brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Razor-Sharp Honing:** Fine 25 micron stone perfects your cutting edge
- • **Mess-Free Sharpening:** Sharpen dry or with water—no oils, no hassle
- • **Ultimate Portability:** Slim 3.25" x 2" stones fit effortlessly in your wallet or pocket
- • **Mirror-Polished Finish:** Extra-fine 9 micron stone polishes to perfection
- • **Precision Edge Restoration:** Coarse 45 micron stone revives dull blades fast

## Overview

The DMT Dia-Sharp 3-pack features credit card-sized diamond sharpening stones in coarse, fine, and extra-fine grits (45, 25, and 9 microns) with a durable monocrystalline diamond surface. Designed for professionals and enthusiasts alike, this portable kit fits in your wallet and sharpens quickly without oils, delivering consistent, precision edges anytime, anywhere.

## Description

Product Description Designed to fit easily into any pocket or wallet, each honing stone comes in a color-coded carry case. 3-piece sharpening system includes a coarse diamond stone (45 micron / 325 mesh) for restoring neglected edges, a fine diamond stone (25 micron / 600 mesh) for honing razor-sharp edges, and an extra-fine diamond stone (9 micron / 1200 mesh) for polishing and refining after sharpening with a coarser diamond. Each diamond plate measures 3.25" x 2" x 0.05". From the Manufacturer Take your sharpening anywhere with the ready-to-go Dia-Sharp credit card sized diamond sharpener. Each one fits easily in pocket or wallet. Each comes in convenient vinyl color-coded carry case. Kit of 3: Coarse diamond (45 micron / 325 mesh) to quickly restore a neglected edge; Fine diamond (25 micron / 600 mesh) for a razor sharp edge; and Extra-Fine (9 micron / 1200 mesh) to polish and refine a razor edge after sharpening with a coarser diamond. Each: 3 1/4-inch x 2-inch x .05-inch Sharpening with diamonds is fast and easy. No messy oils needed--sharpen dry or with water. Durable construction will provide years of consistent performance and reliable service For proper tool maintenance, woodworkers, chefs and other professionals rely on the superior quality and versatility of DMT products. Made in USA.

Review: FULL REVIEW - First of all Excellent Product. They are truly credit card sized. Product Review. How to Use: They are the size of a creditcard, and on the back side of the plate is a sticker that tells you the stones information. Blue says: D3C: Coarse, 45 micron (325 mesh). Red Says: D3F: Fine, 25 micron (600 mesh) Green Says: D3E: Extra Fine, 9 micron (1200 mesh) Under that is the DMT logo with their phone number and website address. THe sticker is clear with the letters in the color related to the identification of the stone mesh. When you hold the sharpening stone plates you can feel the weight to them and if you lightly run your fingers over the sharping side of the stone you can feel the coarseness of the stones. You can also see the diamonds shining on th coarser stones the Blue and Red, as where the green coded plate the extra fine it looks like a piece of polished metal. BREAK IN PROCESS: To break in your stones use a cheap knife if you want I did. you may see little discoloration spots on the stones and trust me, it does nothing to the stone. They still sharpen your tool. It does not take alot of pressure to get these diamonds to cut. I use the amout of pressure on my stones as you would just resting your hand down on a counter relaxed. People saying they when they sharpen their tools or knifes with these stones and the diamonds are coming off, that is because they are pushing too hard. Rarely would it be a product defect. SHARPENING PROCESS: They say you do not need to use water or oil. I get my stones lightly wet with some water before sharpening. The reason is the water on the stones else collect the loose shavings so you don't have to worry about them in the cleaning process. To hand sharpen a knife for example, you can hold the stones in your hand and while *PAYING ATTENTION* sharpen your knife quite easy with out cutting your self. The way I hold the stones is the following. Follow these steps. (wish i could upload photos) Palm up hand open take your ring middle and index finder and put them together, if you have small hands use ur pinky too. Now your thumb you can brace the corner of the stone if you want but you wont need to because you will not need to use alot of pressure, hence the stone wont slide around on your hand. The weight of the stone will be enough to rest in your hand or on your fingers with out it moving around. Now I don't wear gloves while sharpening knifes and I know I should for stones this size and because they are being help in my hand. Yes I can easily cut my self, but I like to feel the stone in my had and I have the experience. For this review I am going to advice you to wear some sore of protective leather gloves, just for my own peace of mind so if you loose concentration or slip you don't cut your self. It requires little pressure and just go slow. one pass should take 2-4 seconds. Do not go fast go slow and steady. Start with the blue stone, then the red stone then the green stone. For touch ups on knifes green or red may be enough. For some good re beveling blue is needed or if it is really dull. If you have to do allot of re beveling and deep shaving these are not the right stones for you. Look into the DMT Dia Sharp 8" Stones. They come in all 6 grits. These are for on the go or even at home simple and quick sharpening. For any big projects like a busted tip knife, super bull knife you need to look into the DMT Dia folds and or the DIA sharp stones. I do say the 8" DIA sharp stones because they are the only size in all 6 Grits. from Extra Extra Coarse to Extra Extra Fine. CLEANING: To clean your stones simply run them under water and get a soft tooth brush from the store and lightly scrub them. the water and the tooth brush is enough to get the metal filings out. Do not use a SOS pad or a metal wire brush Why you ask? 1. these stones will cut the metal from the brush and just embed more metal into them. 2. You can scrape off the diamonds if your pressing really hard. All you need i a tooth brush and some running water. Now for some harder cleaning you can use some commet or dish soap. If you do not press super hard on these stones and use light pressure and rinse/wash them after each tool you clean you wont have shaving deeply embedded in them. I will sharpen 1-3 knifes before cleaning. STORAGE: For storing these stones, please make sure the are 100% dry. After cleaning them as mentioned above you need to dry them. do not rub them dry with a paper towel or a towel. Simply pad them dry. If you want use a hair dryer after padding most of the water off or a air compressor and lightly blow off any extra moisture. Place them back in the corresponding sleeves. I put my stones with the cutting side facing to the colored side of the holder. The reason is the transparent side is a bit short and you have a chance of your stones being slightly exposed and I would rather have the back of the plate corner exposed than the cutting front side exposed. Finally I would recommend these stones to anyone who wants to keep and maintain their tools properly. They are the right size for travel. If you are a prepper they are truly pocket sized and the size of a credit card. It is worth to but this combo pack and not the individuals. You truly use all 3 stones. If you have the bigger bench stones you should still get these. They are small enough and would be perfect for a hunting/fishing tackle box. They will NOT sharpen Serrations. For that you need the "Diafold Serrated Knife Sharpener". I would recommend that you buy all three variations of those as well. I wish these came in Extra coarse and Extra Extra fine. Maybe in the future they will come out with them in those styles. With enough pressure from consumers they will have the incentive to make them. If there is a demand there will be a supply as the person from DMT told me on the phone. If you are ike me and want the 12inch Magna Stones or the "Diafold Serrated Knife Sharpener" in all 6 variations of mesh please call DMT and tell them. They need to know they there is a demand for them before they will make them. I hope this review was helpful if so please click like and comment if you wish. IF it was not helpful please leave me a comment telling me what was not helpful and what information was lacking and I will be more than happy to add the information to the review. Have A Wonderful Day!
Review: Very good product that works perfectly fine. Not sure why some buyers have problems. - I found one of these at work in a drawer of a desk that was unused. I tried it on my EDC knife (a Buck Tempest) and it worked great sharpening it to a very fine razor's edge. I was quite impressed with not only how quickly it produced that edge but how sharp the knife was afterwards. I liked how well that one I found worked, I eventually purchased this set on desertcart which includes the two extra more coarse sharpeners. I have to say that, although the initial use was a bit rough, the extra fine card (the green one) got nice and smooth quickly and now works as well as the original one. I do not have any issues with the original or the new one like other reviewers say they do. These work great on all of my knives. NO problems whatsoever. The original one I found is at least 6 years old and still works as good as the day I found it. I can quickly sharpen my knives with just a few passes and they are indeed sharp. Maybe a bit too sharp for a typical Buck knife as the edge does wear down somewhat quickly indicating it is maybe a bit too sharp. But the genius in this product is I can carry it in my wallet and can sharpen my EDC knife any time I need to. NO need to carry a more bulky sharpening stone or other set (and I have several at home for some extra fine sharpening as needed.) So these are top notch products and work as well as any other sharpener and even better than I expected. The price is so low you really have nothing to lose buying them. I highly recommend them. They just work, period.

## Features

- Diamond Wet Stone Sharpening Kit: Designed to fit easily into any pocket or wallet, each lightweight diamond stone also comes in a convenient, grit color-coded vinyl carry case
- 3 Diamonds: Coarse diamond stone (45 micron / 325 mesh) restores neglected edges; Fine diamond stone (25 micron / 600 mesh) hones edges; Extra-fine diamond stone (9 micron / 1200 mesh) polishes and refines edges
- Portable: Each diamond stone sharpener is conveniently sized at 3.25 x 2 x 0.05 inches, meaning you can take your sharpening anywhere
- Fast & Easy: Micronized monocrystalline diamond surface sharpens edges faster and easier than conventional sharpening stones; No messy oils are needed either -- sharpen lapping plate dry or with water
- Made In The USA: Preferred by professionals for their superior quality and versatility, our durable diamond sharpening stones are built to provide years of consistent performance and reliable service
- Pocket-sized convenience
- 3 different diamond stones--extra-fine to polish and refine an edge, fine for a razor sharp edge, and coarse to transform a dull edge
- Sharpens knives faster than conventional stones with DMT's monocrystalline diamond surface
- No oil is needed-sharpen dry or with water
- Durable construction will provide years of consistent performance and reliable service

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00006IIO3 |
| Best Sellers Rank | #74,670 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #114 in Sharpening Stones |
| Brand Name | DMT (Diamond Machining Technology) |
| Color | Blue, Clear, Red |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,207) |
| Global Trade Identification Number | 00017042007546 |
| Grit Type | Coarse,Extra-fine,Fine |
| Included Components | DMT D3EFC 3-inch Dia-Sharp Sharpener, Credit Card Sized- Extra-Fine, Fine and Coarse Diamond -Set of 3 |
| Item Dimensions L x W x H | 3.25"L x 2"W x 0.05"H |
| Item Type Name | DMT D3EFC 3-inch Dia-Sharp Sharpener, Credit Card Sized- Extra-Fine, Fine and Coarse Diamond -Set of 3 |
| Item Weight | 0.32 Ounces |
| Manufacturer | DMT |
| Manufacturer Warranty Description | Manufacturer Warranty |
| Material Type | Micronized Monocrystalline Diamond |
| UPC | 735090243289 017042007546 798167684781 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** DMT (Diamond Machining Technology)
- **Color:** Blue, Clear, Red
- **Global Trade Identification Number:** 00017042007546
- **Grit Type:** Coarse,Extra-fine,Fine
- **Item Weight:** 0.32 Ounces
- **Manufacturer:** DMT
- **Material:** Micronized Monocrystalline Diamond
- **Number of Items:** 3
- **Product Dimensions:** 3.25"L x 2"W x 0.05"H
- **UPC:** 735090243289 017042007546 798167684781

## Images

![Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack - Image 1](https://m.media-amazon.com/images/I/81QJfBru5wL.jpg)

## Questions & Answers

**Q: How brittle are these? I want to put one in my edc pouch that rides around in my cargo pocket. Will they snap easily if bumped or flexed?**
A: I don't think there is any danger of snapping the Dia-Sharp card by accident (or on purpose, for that matter).  The substrate appears to be steel, about 1.5x the thickness of a credit card, with the finishing surface diamond-impregnated.

**Q: Has anybody tried cutting these in half....to potentially double your usage time?.otherwise, i find the middle doesnt get used, just the edges. ThankS**
A: Never have tried to cut them in half. Haven't experienced your problem with wear either. love these little stones. They do wear out though.

**Q: Is there any abrasive on the card edges?**
A: Just had a look at mine--nope, no abrasive on the edge--the cards are really thin, so I don't there really could be, anyway.

**Q: Can the cards be modified in any way?  Like cutting down to size or drilling holes through them to attach to a lanyard or camping bag?**
A: They are just metal cards with an adhesive matrix that diamond chips are embedded into. You can cut or drill them as you want, but be careful so as to not knock the diamond chips loose from the card.

## Customer Reviews

### ⭐⭐⭐⭐⭐ FULL REVIEW
*by K***7 on September 28, 2014*

First of all Excellent Product. They are truly credit card sized. Product Review. How to Use: They are the size of a creditcard, and on the back side of the plate is a sticker that tells you the stones information. Blue says: D3C: Coarse, 45 micron (325 mesh). Red Says: D3F: Fine, 25 micron (600 mesh) Green Says: D3E: Extra Fine, 9 micron (1200 mesh) Under that is the DMT logo with their phone number and website address. THe sticker is clear with the letters in the color related to the identification of the stone mesh. When you hold the sharpening stone plates you can feel the weight to them and if you lightly run your fingers over the sharping side of the stone you can feel the coarseness of the stones. You can also see the diamonds shining on th coarser stones the Blue and Red, as where the green coded plate the extra fine it looks like a piece of polished metal. BREAK IN PROCESS: To break in your stones use a cheap knife if you want I did. you may see little discoloration spots on the stones and trust me, it does nothing to the stone. They still sharpen your tool. It does not take alot of pressure to get these diamonds to cut. I use the amout of pressure on my stones as you would just resting your hand down on a counter relaxed. People saying they when they sharpen their tools or knifes with these stones and the diamonds are coming off, that is because they are pushing too hard. Rarely would it be a product defect. SHARPENING PROCESS: They say you do not need to use water or oil. I get my stones lightly wet with some water before sharpening. The reason is the water on the stones else collect the loose shavings so you don't have to worry about them in the cleaning process. To hand sharpen a knife for example, you can hold the stones in your hand and while *PAYING ATTENTION* sharpen your knife quite easy with out cutting your self. The way I hold the stones is the following. Follow these steps. (wish i could upload photos) Palm up hand open take your ring middle and index finder and put them together, if you have small hands use ur pinky too. Now your thumb you can brace the corner of the stone if you want but you wont need to because you will not need to use alot of pressure, hence the stone wont slide around on your hand. The weight of the stone will be enough to rest in your hand or on your fingers with out it moving around. Now I don't wear gloves while sharpening knifes and I know I should for stones this size and because they are being help in my hand. Yes I can easily cut my self, but I like to feel the stone in my had and I have the experience. For this review I am going to advice you to wear some sore of protective leather gloves, just for my own peace of mind so if you loose concentration or slip you don't cut your self. It requires little pressure and just go slow. one pass should take 2-4 seconds. Do not go fast go slow and steady. Start with the blue stone, then the red stone then the green stone. For touch ups on knifes green or red may be enough. For some good re beveling blue is needed or if it is really dull. If you have to do allot of re beveling and deep shaving these are not the right stones for you. Look into the DMT Dia Sharp 8" Stones. They come in all 6 grits. These are for on the go or even at home simple and quick sharpening. For any big projects like a busted tip knife, super bull knife you need to look into the DMT Dia folds and or the DIA sharp stones. I do say the 8" DIA sharp stones because they are the only size in all 6 Grits. from Extra Extra Coarse to Extra Extra Fine. CLEANING: To clean your stones simply run them under water and get a soft tooth brush from the store and lightly scrub them. the water and the tooth brush is enough to get the metal filings out. Do not use a SOS pad or a metal wire brush Why you ask? 1. these stones will cut the metal from the brush and just embed more metal into them. 2. You can scrape off the diamonds if your pressing really hard. All you need i a tooth brush and some running water. Now for some harder cleaning you can use some commet or dish soap. If you do not press super hard on these stones and use light pressure and rinse/wash them after each tool you clean you wont have shaving deeply embedded in them. I will sharpen 1-3 knifes before cleaning. STORAGE: For storing these stones, please make sure the are 100% dry. After cleaning them as mentioned above you need to dry them. do not rub them dry with a paper towel or a towel. Simply pad them dry. If you want use a hair dryer after padding most of the water off or a air compressor and lightly blow off any extra moisture. Place them back in the corresponding sleeves. I put my stones with the cutting side facing to the colored side of the holder. The reason is the transparent side is a bit short and you have a chance of your stones being slightly exposed and I would rather have the back of the plate corner exposed than the cutting front side exposed. Finally I would recommend these stones to anyone who wants to keep and maintain their tools properly. They are the right size for travel. If you are a prepper they are truly pocket sized and the size of a credit card. It is worth to but this combo pack and not the individuals. You truly use all 3 stones. If you have the bigger bench stones you should still get these. They are small enough and would be perfect for a hunting/fishing tackle box. They will NOT sharpen Serrations. For that you need the "Diafold Serrated Knife Sharpener". I would recommend that you buy all three variations of those as well. I wish these came in Extra coarse and Extra Extra fine. Maybe in the future they will come out with them in those styles. With enough pressure from consumers they will have the incentive to make them. If there is a demand there will be a supply as the person from DMT told me on the phone. If you are ike me and want the 12inch Magna Stones or the "Diafold Serrated Knife Sharpener" in all 6 variations of mesh please call DMT and tell them. They need to know they there is a demand for them before they will make them. I hope this review was helpful if so please click like and comment if you wish. IF it was not helpful please leave me a comment telling me what was not helpful and what information was lacking and I will be more than happy to add the information to the review. Have A Wonderful Day!

### ⭐⭐⭐⭐⭐ Very good product that works perfectly fine. Not sure why some buyers have problems.
*by K***R on January 15, 2022*

I found one of these at work in a drawer of a desk that was unused. I tried it on my EDC knife (a Buck Tempest) and it worked great sharpening it to a very fine razor's edge. I was quite impressed with not only how quickly it produced that edge but how sharp the knife was afterwards. I liked how well that one I found worked, I eventually purchased this set on Amazon which includes the two extra more coarse sharpeners. I have to say that, although the initial use was a bit rough, the extra fine card (the green one) got nice and smooth quickly and now works as well as the original one. I do not have any issues with the original or the new one like other reviewers say they do. These work great on all of my knives. NO problems whatsoever. The original one I found is at least 6 years old and still works as good as the day I found it. I can quickly sharpen my knives with just a few passes and they are indeed sharp. Maybe a bit too sharp for a typical Buck knife as the edge does wear down somewhat quickly indicating it is maybe a bit too sharp. But the genius in this product is I can carry it in my wallet and can sharpen my EDC knife any time I need to. NO need to carry a more bulky sharpening stone or other set (and I have several at home for some extra fine sharpening as needed.) So these are top notch products and work as well as any other sharpener and even better than I expected. The price is so low you really have nothing to lose buying them. I highly recommend them. They just work, period.

### ⭐⭐⭐⭐ ... first "real" set and they do the job just fine. The size is a drawback if you want ...
*by T***L on November 28, 2015*

I do not have a lot of experience with sharpeners but this was my first "real" set and they do the job just fine. The size is a drawback if you want to sharpen, say, a large iron for a hand plane but other than that it works great for my chisels, #4 plane irons, and scissors. The price was what initially drew me in and I they have held up pretty well after a solid 3 months of moderate to heavy use. I would recommend these for someone who needs a good pair of small sharpeners. Paired with an anti slip mat so as they won't slide away, they are a good buy (don't forget the leather and charge such as chromium oxide).

## Frequently Bought Together

- Diamond Machining Technology (DMT) Dia-Sharp Diamond Sharpening Stone Credit Card, Extra Fine, Fine & Coarse, 3 Pack
- Trend Diamond Abrasive Lapping Fluid, 3.4 fl oz, Blue, Professional Grade Sharpening Fluid for Optimum Performance, DWS/LF/100
- DMT (Diamond Machining Technology) 2.5-in. DiaSharp Diamond Mini-Hone Sharpening Kit of Coarse, Fine, and Extra Fine Grit Sharpeners (D2K)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-04-29*