***Please keep in mind these are all approximations. If you have questions in terms of sizing, please email us: contact@dukeduchessjewelers.com 


Ways to Figure out the Best Ring Size

There are a few easy ways to find out your best ring size. You want to keep in mind that the best ring size is the one that gives your chosen finger mobility and flexibility.


It is always good to keep your chosen ring mm WIDTH in mind when it comes time to purchase the ring. This means the wider the width of the band/ring, the larger the ring size should be to accommodate this wider width, as it will lay closer to each knuckle.


It is also important to recognize the ring shape as a factor in determining the best ring finger size. If it has a geometric shape, you may allow for a slightly larger size so the ring is comfortable enough with its square edges, for example.



The United States ring guide charts are designated with millimetres on the interior of the ring, or the interior part that will actually lay on the finger.


Ring Size and Body Weight Fluctuations:

Not only is it important to leave enough room for the finger to move, but it is also important to keep weight fluctuations in mind. As the body may change or water/weight retention may occur given a variety of circumstances, it is ideal that the ring can be removed or placed on easily.


It is also important to note that there are different ring sizes that are in the USA and other countries. The comprehensive chart on this website will aid in determining your correct ring finger size.





This simple tool can be printed and cut out. Insert the small end to the larger part of the paper and place it around the finger. Here is a tool for women’s rings:



1. Use a small piece of string, yarn, or thread you have. You may also use a piece of paper. If you use paper, cut it in the approximate width you would for the ring you have in mind.


Please note: it is important that you cut the amount that can easily be wrapped around your designated finger for sizing, so approximately 3 inches long. Clearly marking this material will aid in the best at-home fit.


2. Take the string/yarn and wrap it around your finger. Make sure that it fits closely, yet provides comfort when you move your hand or finger.


3. Mark the string/piece of paper with a marker so you can clearly see where it was laying once wrapped around your finger.


4. Use a ruler/measuring tape and convert your finding from inches to mm so you can determine your most comfortable size. This will give you an approximate value in determining your ring finger size.


It will look like a long piece of paper that you have cut that will be able to comfortably wrap around your finger. Same goes for the floss. Once the material overlaps each other; i.e. you have put it all the way around and it meets at the beginning spot, mark it with a marker or pen. This will be your approximate ring finger size. Measure this amount with a ruler on the MM side.



Both men’s and women’s ring sizes most commonly come in half or whole sizes. However, quarter sizes are also available. This includes such a ring size as 7.25, for example.  Rings can be resized to quarter sizes only if the design supports such a modification. For example, an eternity band with stones running all the way around it most likely cannot be resized. An engagement ring with stones on the top is most likely resizable.


Rings can also have round metal balls soldered in the inside by a jeweler, which are called cleats. Cleats help fill in the larger size without damaging the original design of the ring.


Ring size guards or other ring size reducer designs are small pieces of metal or other material that can be attached inside the ring or underneath it. They may be bent and manipulated to accommodate your preferred size. These accessories are simply add-ons that are not part of the original ring. These add-ons can be placed on and removed from the ring with no damage or permanent modification to the ring.