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Diamond Polishing Paste 0.25 micron (Finest) - 90 micron.


If you want to get a mirror finish or remove scratches and marks on glass, stone or hard metals then our diamond polishing paste is a must. Available in 9 different grades from super fine to extra coarse. You can take a relatively coarse and grained looking piece of work down to a superb mirror finish in no time.

The KD-C1 diamond grinding paste is mixed with a water soluble oil and comes in an easy to apply 5g syringe so the paste is ready to use and is easy to apply. Diamond Paste for polishing is for use on glass, hard metals, ceramic and mineral surfaces to give a superfine mirror finish. Made in the UK

  • 0.25 - 3 micron for final polishing
  • 6 - 14 micron for lapping and pre-polishing
  • 25 - 90 micron for rapid stock removal

The shelf life of our diamond paste is 2 years from the date of purchase. Our diamond paste is made here in the UK and is made fresh with each new batch. We have a regular turnaround of stock so you can be sure the paste you purchase is fresh. 

Read on for further information on the application, Diamond Compound uses and a Micron to Grit conversion chart.

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Diamond Polishing Paste

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Micron (µ), Grit (#) & Mesh Conversion Chart

Diamond Polishing Paste Grades:


Helpful tip: Apply the diamond polishing compound with a piece of wood such as a peg, pegwood or a toothpick (for very detailed work), a piece of leather or flexible plastic or one of our felt polishing bobs

The finer grades, such as 0.25µ of diamond paste, will absorb into wool, felt or material, so be sure to apply these with wood, leather or plastic.

  • Use on silver: In recent tests, it has been found that using the 8 micron first, followed by the  3 micron and finishing with the 1 micron leaves a wonderful mirror finish to silver.
  • Many scientists use the 0.25 micron to give a microscopic ultra-smooth finish and this grade is often used for polishing optical glass
  • Ideal for removing scratches on: watch glass, glass or gemstones. Try starting with 6 micron (yellow) then 3 micron (green) and so on until the desired finish is achieved. 
  • 14 micron paste is excellent as a glass cleaner on stubborn scratches on the glass of Wood Fire Burning Stoves.
  • For glass engraving, use the diamond paste for the final polishing stages, applying a tiny amount to a felt bob or point.
  • Use finer grits such as 1 micron to restore and polish jewels or for a superfine polish after removing scratches. 
  • Our diamond grinding paste will also restore the shine to fused glass edges.

How to use Diamond Polishing Paste

Diamond paste for polishing is done progressively, starting with a coarser grade, i.e. 6 microns, and then finishing with the 1 or quarter micron grade. If the work you are polishing is already of a reasonable finish, then you can often skip the coarser grades and start with the 3 or 1 micron.

To apply the paste, you can either use a felt polishing bob on a rotary tool, a piece of leather or wood or if polishing a pivot, apply the paste directly and then use a wooden peg to grind with.

Alternatively, apply to a soft wheel using a canvas belt, one belt for each grade. There are so many ways to apply the diamond paste. Everyone seems to have their own method; I have even heard of one horologist using some old camera film!


KD-C1 Diamond powder in water soluble oil

  • Plastic Syringe: 5g
  • 0.25 - 3 micron: for final polishing
  • 6 - 14 micron: for lapping and pre-polishing
  • 25 - 90 micron: for rapid stock removal

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Questions & Answers

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Other questions and our answers

I need to remove scratches from the surface of glass can I do that with this paste?

LInda Paterson

Yes you certainly can Linda. Use a little of the diamond paste on a felt bob in your rotary tool, or if using by hand, apply the paste to something that will not absorb too much of the diamond paste such as plastic, wood or leather. Work your way down through the grades of the diamond paste starting off with 3 micron (green) then 1 micron (blue) until the desired finish is achieved. Of course if the scratch is deep then you may need to start off with a coarser grade such as 6 micron. Our silicone polishers (MSPM)  will also do the same job, again working through from coarse, medium, fine and extra fine until you have achieved the desired finish. 

what is the shelf life of these pastes please, obviously a little goes a long way so was wondering how many years its good for before the carrier paste breaks down?

Brian W Birkmyre

Hello Brian, 

The shelf life of our diamond paste is 2 years from the date of purchase.

We have the paste freshly made each time we get a new batch in and  we have a regular turnaround of stock as well so you can be sure the paste you purchase is fresh and hasn't been sitting in the warehouse for years. 

Kind Regards,  


I have some scuffs and small scratches on my watch face. But there are also some heavy scratches to the bezel as well. Would this paste work in clearing both the glass and the bezel?


 Yes the diamond paste will work both on the glass watch face and the bezel. 

Hi, I was engraving and I made a mistake, My burr touch the glass on the wrong place and it left a scratch. I'm wondering if this paste can remove it ? I already try cerium oxyde powder and it doesn't work. Thanks


Yes the diamond paste is ideal for this type of scratch. Keep within the lines of the scratch as much as possible to avoid the rest of the glass being marked. If the scratch is very very light try using the 1 micron. If it is deeper use the 3 micron then the 1 micron.

I’d like to cut and smooth some tungsten carbide , will these discs do the job?


The diamond slitting discs would be perfect for the cutting of your carbide.  To smooth, try our 600 grit diamond files. To polish the tungsten carbide you can use our diamond grinding paste. 

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