Ring size

A Beginner’s Guide On How To Determine Your Ring Size

If you are going to wear a ring, it is critical to know what your ring size is. Determining your proper ring size helps ensure the ring not only fits on your finger but remains on your finger. The last thing you want is for the ring to slip off, especially without your knowledge. There are a few different ways you can go about finding your ring size.

Now, if you are looking to measure the ring size for a significant other in secret, there are a few other options you need to consider. Thankfully, if you’re going to pop the question, the ring doesn’t need to be the perfect size as any jeweler will resize the ring (the jeweler you buy it from should provide this as a free service for buying the ring). So whether you’re buying a green diamond ring for yourself or you’re measuring ring size for someone else, there are a few different ways to collect this information.

What Is Your Ring Size?

Your ring size is just like a shoe size or clothing size. It takes a specific circumferences measurement of your finger at its widest point. Some individuals have wider knuckles compared to the rest of their fingers, so if you have wider knuckles, your ring size will be the size of your knuckle. Then, when you purchase a ring (or have it resized), it will perfectly fit the finger in question without slipping off.

Ring size


All ring sizes are universal, and there is a universal way to measure the ring. This way, whether you buy it at a local jeweler in Minnesota or you buy it from a name brand in New York City, you will receive the same ring size measurement.


Ring sizes begin at a size 4 and increase to a size 13.5 (it is always possible to get a larger or smaller ring size, although these must be specially ordered or purchased from shops dedicated to handling these different sized rings). A size 4 has a circumfluence of 14.8 mm. It then goes up to a size 4.5, which has a circumference of 15.3 mm The subsequent ring sizes are:

  • 5 – 15.7 mm
  • 5.5 – 16.1 mm
  • 6 – 16.5 mm
  • 6.5 – 16.9 mm
  • 6.5 – 16.9 mm
  • 7.5 – 17.7 mm
  • 8 – 18.2 mm
  • 8.5 – 18.5 mm
  • 9 – 18.9 mm
  • 9.5 – 19.4mm
  • 10 – 18.8 mm
  • 10.5 – 20.2 mm
  • 11 – 20.7 mm
  • 11.5 – 21.1 mm
  • 12 – 21.5 mm
  • 12.5 – 21.9 mm
  • 13 – 22.3 mm
  • 13.5 – 22.8 mm

Can I Test From Home?

It is possible to determine the ring size for a green diamond ring at home. It is always recommended to go to a professional jeweler to have them measure your finger as this will ensure accuracy, but there are other options in case you need it. First, at the jeweler, they will provide this service for free.

ring being worn on finger

If performing the test at home, you can do this using a string. Wrap a string around the widest part of the finger you wish to wear the green diamond ring. Now, once you have the measurement, set it out against a ruler that has millimeters. This will give you the total measurement. 

But if you want to take ring measurements at home more accurately, then consider getting a ring sizer. Buying a ring, especially an engagement ring, is quite a substantial investment. To ensure that you make the correct ring purchase and reduce the chances (and hassle) of going back to the jeweler for resizing, buying a ring sizer would make perfect sense. On top of accuracy, a ring sizer also helps you measure ring size more quickly and easily.

Ring sizer

Now, if you’re trying to figure out the green diamond ring size of a significant other and you don’t want them to know, you must figure out a way to be sneaky. First, you can buy the individual a different ring. It can be a gift with a birthstone or something else significant. You’ll be able to see how it fits and if they need to have it adjusted. It is best to space this out away from the actual engagement ring (if that is what you’re looking at buying) so that they don’t think the test ring isn’t the engagement ring. The next option is to ask a friend or relative of the individual to help.


Most close friends and family members love to be included in this kind of work. Most people don’t have the opportunity to be a spy, so this is as close as they will ever become. They can be out with your significant other at the mall, and they bring up the idea of getting rings sized or trying things on. They can also simply ask.  They will probably know a better way as to what needs to be done to gain the appropriate measurement. If they already have another ring, you can take it to a jeweler and ask them what size it is. Or, if they would notice it missing, you can place it on a piece of paper and trace around it.

 This will give you an outline you can work with without being forced to take the ring (and you may not feel comfortable taking his or her great-grandmother’s ring that had been in the family for generations). You can also do the old try on their ring test. You take a ring the individual is wearing, and you try to put it on one of your fingers. It’s fine if it doesn’t fit. Maybe you can only get it halfway down your pinky. That will give you a pretty good measuring stick to use when you go to the jeweler. From there, you can go into the jeweler and ask them for what ring size would do the same which should give you a good idea what size they might wear.

How To Get The Correct Size

To get the correct size the best way is to always go into a jeweler and have them measure your finger. Whether you’re going to wear a green diamond ring or something else altogether, it doesn’t matter. They will take your ring measurement in just a few moments. It won’t take long at all to have the ring measured out properly either.

ring on woman's finger

If you’re working off of imperfect information, such as you traced around a ring the person had or you’re just guessing, it is always best to go slightly larger than the slightly smaller. At least with the slightly larger ring, it will fit on his or her finger. It takes the excitement out of it if you put the ring on and it doesn’t move past the knuckle. You may even want to pick up ring sizers to keep with you after giving the gift (or popping the question).


You can buy these from most jewelry stores. The ring sizers will fill in the space between the ring and the skin. This way, at least until you can have the ring sized, you’ll be able to fit the ring on your significant other and worry less about it falling off (of course, they will probably be looking at the ring non-stop, in which case that shouldn’t be much of a problem).


There are so many incredible rings out there. It doesn’t matter if you’re looking to buy a green diamond ring or just a class ring, you’ll always need to seek out an appropriate ring size. Now, if you’re getting it for yourself, you have a few different options. The best way to get an accurate ring size is to have your finger measured by a professional.


This is easily done at a local jeweler as ring sizes are universally the same. You can also do a good job at coming up with your ring size by measuring the circumferences of the widest point of your finger, then correspond it with one of the ring sizes that best fits you. This doesn’t take long, and you probably have all the tools you need on hand at home.


If you need to find a diamond ring size for a significant other or any other person, you will likely need to sneak around to determine this information. However, trying to find out their ring size is part of the fun. From bringing in the help of a close friend or if you go through their jewelry box and trace around a current ring, there is no shortage of ways for you to determine the correct and accurate size.

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