If you can’t stretch your ring at home, consider getting it done professionally be a jeweler.
Consider getting a steel mandrel, because they are more versatile, and you can even use one to stretch your ring.
Note that it’s impossible to have a ring fit perfectly, because our fingers change size throughout the day based on temperature, exercise, and time of day. [5] X Research source A ring should fit snugly without making your finger bulge around it or leaving indent marks.
Make sure you find a conversion chart for your country, because different countries have different ring measurement systems. Fingers get smaller in the cold, so make sure you are warm before you size your finger.
Jewelers have other methods for enlarging rings that don’t thin the metal, such as cutting the ring open and adding metal. [8] X Research source
The top pin is the part you will hammer, and it will push open the slotted part so that it evenly opens up your ring.
You should be able to see the bottom of the ring stretcher opening slightly as you tap.
Remember, it’s easy to stretch your ring, but harder to shrink it, so stretch it in small increments.
If you want a slightly more secure set up, get a bench pin which can secure your steel mandrel to your table, but you can also just hold the mandrel.
Your hammer strokes should be parallel with the mandrel, so that you’re gently pushing the ring further down toward the thicker end of the mandrel. Don’t use a metal hammer for this, because it may dent and mar the surface of your ring.
Stop when you’ve gone all the way around once.
If your ring is a little bit stuck on the mandrel when you’re trying to remove it, just tap it lightly in the other direction with your hammer until it loosens. [15] X Research source
