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Diamond Polishing Paste 0.25 micron (Finest) - 90 micron


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

The 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. Use on glass, metals, ceramic and mineral surfaces to give a superfine mirror finish.

  • 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 fresh with each new batch and we have a regular turnaround of stock so you can be sure the paste you purchase is fresh. 

Read on further information and a Micron to Grit conversion chart

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Diamond Polishing Paste

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Approximate conversion chart for Micron to Grit:

  • 0.25 micron = 60,000 grit
  • 1 micron = 14,000 grit
  • 3 micron = 12,000 grit
  • 6 micron = 6,000 grit
  • 8 micron = 3,000 grit
  • 14 micron = 1,200 grit
  • 25 micron = 800 grit
  • 45 micron = 325 grit
  • 90 micron = 140 grit

TIP: Apply with a piece of wood such as a peg or tooth pick (for very detailed work), a piece of leather or flexible plastic or one of our felt polishing bobs. The finer grades of paste will absorb into wool, felt or material so be sure to apply these with wood, leather or plastic.

Many scientists use the 0.25 micron to give a microscopic ultra smooth finish. 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.

For glass engraving, use the diamond paste for the final stages of polishing, applying a tiny amount to a felt bob or point.

Our diamond grinding paste will restore the shine to fused glass edges as well.

How to use our Diamond Polishing Paste

Most diamond paste grinding and polishing is done progressively, starting with the coarser grade, 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 then 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 paste it seems that everyone has their own method, I have even heard of one horologist using some old camera film!


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

Customer Reviews

Not used it yet but I have no worries.
Did the job great on hard crystal peices,removing surface scratches and generally improving surface finish.
Works just as I wanted, and larger quantity than most selling the same.
The product recommended was for lapping ruby pallet stones for a clock,It was perfect for my needs

Questions & Answers

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Other questions and our answers

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. 

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 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. 

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