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How to Polish Rocks With a Dremel Drill? Follow These 4 Steps

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Getting from raw rock to polished stone is daunting, but if you follow this process, you’re bound to get a specimen you’re proud of. The Dremel is a great tool for the job – providing more control over the final stone’s shape and texture than other polishing methods.

To make a rock shop quality shimmering stone, you’ll need the last rock you found, some sanding and grinding Dremel bits, a rock polishing compound, and some personal protective equipment.

First, correctly shape your stone, scrub any dirt, and lose rocks off. Now, use the Dremel with a sanding bit and cycle through 3 to 5 different grits – a typical sequence is 600, 800, and finally 1200. Now dip a polishing wheel bit in a rock polishing compound and buff the stone. Finally, wipe it off and find a spot for display.

As you go through this process, you’ll want to remember that the unique properties of the mineral you’re polishing will change how you perform these steps. For best results, estimate or find out the mineral’s hardness before starting out.

How to Polish Rocks with a Dremel Drill
How to Polish Rocks With a Dremel Drill?

If you want to check out the best Dremel drills, you can find them here (Amazon link).

Step 1. Cut the Rock Down to Size

I know you want to get straight to getting a shine on the rock you’re holding, but this step is the most important of all of them.

In this hobby, you’ll want to invest in a good hammer and set of chisels eventually, but if you don’t want to get one right now, try to choose an appropriate size stone the first time around – afterward, you’ll have a better feel for it.

Keep these things in mind when sizing the rock:

  1. You’ll have to hold or clamp this stone while you polish it – a smaller stone will be harder to grip.
  2. A larger stone takes substantially longer to smooth out. This is especially the case if you have a harder stone.
  3. Look for natural faults in your rock. If possible, you’ll want to take these out because the sanding pressure may cause them to break.
  4. There is much less work and time involved in chiseling rock than sanding it off – get as close as possible before you start.
  5. If the rock is for a singular display, you should choose a larger size than if it will go in a set.

TIP: Cutting rocks to the right size can be tricky sometimes. That’s why I wrote an article with a step-by-step guide on how to cut rocks with a hammer and chisel. Feel free to read it here:
Step-by-Step: How to Cut Rocks with Hammer and Chisel

Step 2. Scrub Thoroughly

Get a bucket of warm, soapy water and a fingernail brush. Toothbrushes are typically recommended for this task, but only use a toothbrush if your stone is relatively soft.

If you do not know what the hardness of your stone is, look for layering, which seems like it would be too fragile or delicate for intense scrubbing. You can also find another stiff, coarse, and strong cleaning material if you do not have a fingernail brush.

Cleaning your stone before you start sanding is essential for two reasons.

  1. It gets dirt and loose stone off and, while wet and naturally shinier, gives you a small taste of what the final product will look like.
  2. It will show you if your stone is able and ready to be polished.

A fingernail brush is the only way to achieve the second task because scrubbing will put similar pressure on the rock as sanding. It will uncover hidden fissures in the stone that may break later.

In this way, you can feel how much pressure your specimen can take, which is good information in the sanding phase, and you can sort out unfit stones and save yourself some time and heartache.

Step 3. Cycle through Sanding Grits

Now, let’s move to the Polish part. I tried to describe this part in more detail and divided it into several parts. So, let’s start!


If you have one, set your clean, nicely cut stone in a clamp on a stable surface. Otherwise, find a place to easily sweep later and get some gloves you don’t mind sanding a bit.

Ideally, grab some safety glasses, too. If you need them, I recommend buying these gloves and these safety glasses. (Amazon links)

A Dremel tool with a higher RPM is a good idea for the sanding process and is definitely recommended if you’re polishing quartz or a mineral with similar hardness.

Especially if your tool is similar to a Dremel but not the exact brand, check to make sure it has an RPM of above 10,000.

The battery-powered tools often have less RPM than the chorded tools, so keep an eye out for that if you’re in the market for one.

I recommend buying one of these two dremel drills:

  • The first one is a great option if you just started with rock polishing. This Dremel drill offers great value for the money, and the kit contains all the accessories you need. The Dremel comes with 5-step speeds from 8,000 to 30,000 RPM. You can buy it here. (Amazon link)
  • The second one is a great option for the more advanced polishers who use a Dremel drill to polish rocks more often. It has all the needed accessories and offers variable speeds from 5,000 to 35,000 RPM with electronic feedback for consistent performance. You can buy it here. (Amazon link)

TIP: It is always good to clean your rocks before polishing. Do you know how to clean your rocks effectively? Check out the simple ideas in the article below:
How to Clean Your Rocks and Minerals: 5 Simple Ideas

Choosing the First Attachment

Now, you need to choose a starting sanding grit. The purpose of the first stage of sanding grit is mainly to shape the stone.

Rounding out all the corners and sharp edges and perfecting the final shape should all be done in this stage, but it’s also important to give the whole stone a once-over with the coarse grit or silicon carbide, even if it doesn’t need reshaping.

Dremel attachments come with various materials and shapes – here I’ll give you a brief overview of some that may be useful, though you’ll find out anyway if you’re the experimenting type like me.

Aluminum Oxide

– Brown
– Typically 3-5 shapes
– Common in most sets
– Typically confused with a sander but made for metal
Silicon Carbide

– Brown
– Typically 3 to 5 shapes
– Common in most sets
– Typically confused with a sander but made for metal
Grinding Wheels

– More stability
– Great for the first round of smoothing or for shaping

– Typically labeled with their grit
– Feels a bit like plastic
– Mostly come in cylinders
– Most sets come with 600, 800, 1000, and 1200 grits (choose 600 to start for an average stone)

Typically, using a silicon carbide attachment first will have the most effect – you can see the stone changing shape as you use it physically. A round with this tool should only take 3-4 minutes; the sanding rounds will take more time.

You’re done with the first round when the stone is in its final desired shape – no bumps which are big enough to change the visible shape of the stone.

TIP: As you already know, the best tools for polishing rocks and adding a soft glimmer are the rotary dremels. Check out the complete guide about the best deals in the article below:
3 Best Dremels for Polishing Rocks & Crystals + Accessories

Cycling Through

Now that you’ve got a feel for the tool’s ergonomics feel free to choose the shape of your first sanding tool wisely. It’s a balance between pressure and preciseness – be patient, and don’t be afraid to switch out the shape if it isn’t working well for you.

Move to the 600 grit and spend 5 minutes sanding each area from different angles. Though the stone might look round, there are different structures on the surface that you can’t see, so it’s a good idea to sand from different directions.

Start with the 800 grit when the texture feels smoother to the touch. Spend another 5-6 minutes with this grit, depending on the size and properties of the stone.

In general, try only to switch grits when you see a noticeable difference. You’ll get better at noticing changes through the sanding process, but another trick is to look at the reflection of light in the stone.

Every rock will be different, but if you can see the reflection quality change as you sand, only stop once the reflection quality stops changing.

A rock’s texture is the best indicator of how it’s responding to the sanding. Try to feel changes by feeling it with the thumb or even rubbing it on a forearm.

Cycle through the rest of the grits similarly, always choosing a new grit when it has no effect until the 1200 grit.

TIP: Have the rocks in your collection become duller or less vibrant than they were when you first washed and polished them? Check out the simple ideas on how to make your rocks look wet in the article below:
7 Simple Ideas: What to Put on Rocks to Make Them Look Wet


If at any time during the process, you feel like it isn’t working well, don’t be afraid to increase the pressure you apply – sanding works with friction, and the Dremel is a hardy tool. It can handle it.

Harder stones will require longer and typically more pressure applied, but try the former before the latter. Texture and reflectance will respond differently depending on your stone, so remember to study each stone differently.

You can stop when you’re happy with the natural shimmer of your stone. Every stone has a different “maximum” shine, so if you aren’t sure whether or not more sanding will have an effect, search the internet for polished pictures of your mineral. Remember, it will become slightly shinier during the polishing phase.

BTW: Do you want to know more about rock and mineral identification? The books listed below are the best ones you can find on the internet (Amazon links):

Step 4: Buff with Polish

Replace the Dremel bit with a felt or leather wheel or cylinder. The best material for polishing depends on the type of stone and the type of polish. The best material and polishing compounds can be found here.

Dip the cylinder in the compound and buff all areas of the stone. This, too, should take a few seconds for each spot, but minimal pressure should be applied.

Now wipe your stone (it won’t remove the polish) and find a spot to display!

TIP: Do you know you can tumble rocks without a rock tumbler? Yes, it is possible, and it is quite easy. Find out more in the article below:
Can You Tumble Rocks Without a Tumbler? Step-by-Step Guide