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How to Size a Ring Up

Ring sizing is not as difficult as it looks, however, do your research on the type of issues you may encounter. Learn how to size a ring up in this article on jewelry studio techniques.

Having the skills to size rings can be very handy for your jewelry studio business, especially if you don't have the right size for a customer in stock. Learn sizing to capture more sales and offer superior service to your clients.

Ring sizing skills can be very handy for your business and your customers. If you don't have the right size for a customer at a show, you can offer ring sizing to make sure you get the sale. Or, you can offer sizing as a general repair service for your studio. 

Sizing rings can be a very handy skill to learn, however, the trick is to know when it's something you can or can't do with your present skill sets.

There are a lot of problems that can arise when you size up rings. Simple bands are the easiest. When you get into bands that have patterns or stone settings, the work becomes a little harder and there are some you just can't do. When sizing a finger ring band, you can generally move it two sizes larger when stretching it. However, it has to have a really good solder join before attempting this. If it doesn't, plan to split the seam, add some metal, re-solder and then finish it.

Rings with settings entail more consideration. You need to think about the setting and whether it can be stretched, soldered, or better left untouched altogether. If you are sizing the ring up, stretching it will most likely distort the setting and loosen the stone. Sometimes you can adjust by reshaping it slightly. Paved or gypsy settings cannot be stretched with a tool. You may be able to shank the band and solder an insert instead. And it's impossible to resize a ring with flush settings. Also, can the stone take the heat of a torch or do you need to remove it? How easy is that to do? Do your research and proceed with caution.


When you resize a ring it stretches the metal creating a wider band, but the downside is thinner metal. This is a highly recommended way to resize a ring band. Be sure that the gauge is thick enough, it is within the two size limit and that any solder join is strong.

When practicing with new tools or learning new skills, I like using copper or brass material before moving onto sterling silver. I definitely encourage practice runs with the tools I'm going to show you in this post.

Rathburn Ring Stretcher

The Rathburn ring stretcher is small, lightweight and easy to carry on the road. Perfect for shows, when you need to resize a ring for a customer. It comes packaged in three parts that fit nicely together, to keep it compact. All you need is a hammer to tap the top, which in turn stretches the ring. The ring stretcher fits rings ranging from size 7 to 10 (size 6 may work but you'll really need to squeeze the ring on there).

Steel Ring Mandrel

The basic steel ring mandrel is a ring sizing staple. It's made from hardened tool steel, easy to hold in your hand and only requires a rawhide hammer to resize rings. Sizes range from 1 to 15, so the ring size coverage is great. The downside is that it can be awkward in your hand, especially when you're just starting out and stretching a ring with a mandrel takes more time and effort than with a ring stretcher.

360 degrees Ball Joint Ring Mandrel with Bench Vise

Another alternative to the steel ring mandrel is our 360 degree Ball Joint Ring Mandrel with Bench Vise. This is handy if you need both hands-free, rather than one holding onto the mandrel. The mandrel is removable so you can use that alone if you want to, but if it's attached to the vise, it moves 360 degrees so you can work on a ring at any angle that you may need. The mandrel itself will fit ring sizes 1 to 15.

Ring Stretcher and Reducer

This is a perfect all-in-one tool when stretching and reducing rings is needed. The ring stretcher and reducer is heavy-duty, yet easy to use. It's a great metalsmithing tool to have on hand if you create a lot of ring bands. If you run out of material, use a band you already have to reduce or stretch it to the desired size.

Ring Sizing by Torch

If your ring band has settings and stones on it, you may want to resize it by soldering. If the stones can't take the heat, remove them from the settings before working on the band.

finger ring bands
Centering finger ring bands

Step 1: Find the center of the band (graph paper works well).

Step 2: Mark the center line at the bottom of the band.

Ring conversion chart
Step 3: Using the chart above, figure out the amount of metal you will need to add to the band.

For this example, I want to go from a size 7 up to a size 8. I take the difference between 54mm and 56.6mm, so I need to add 2.6mm of jewelry making metal. Find a metal wire segment or use a scrap piece of sheet to add to your band. It's okay if it's a thicker gauge piece, you can file it down later. But, be sure to add a piece that's the right length.

Step 4: Cut the band in half with a saw.

Sterling silver ring band
Separating the ring band

Step 5: Separate the two sides of the ring band either by hand or on a ring mandrel.

Step 6: File all the ends of the metal pieces.

Step 7: Slide the new piece of metal into the band, checking that it is a tight fit.

Soldering sterling silver finger rings
Adding material to the finger ring

Step 8: Place a piece of soft solder under each join then flux, solder and quench.

Step 9: Finish the piece completely before moving on to the final step.

Step 10: Reset the stones.

Be sure to check for any markings on the band before working with it. You will need to re-stamp any metal marks or special notes, or tell the customer they may lose those markings.

To find out how to reduce a ring size, check out our blog: How to Size a Ring Down.

Keep Reading!

Jewelry Ring Design Tips & Ideas

How To Buy Ring Making Material

4 Ideas For Embellishing Ring Bands

Halstead is one of North America's leading distributors of jewelry supplies. The firm is celebrating its 46th anniversary this year. Halstead specializes in wholesale findings, chain, and metals for jewelry artists.

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