Useful Strategies to Find His or Her Ring Size

A situation we often have to face - so here is some help

So you’re taking the leap, you’re ready to propose, you’ve found a diamond and are ready to create your bespoke engagement ring. There’s just one problem . . . you don’t know his or her ring size and you want it to be a surprise! How do you navigate this tricky situation without ruining the element of surprise? Seven out of ten of our customers overlook this important step but fret not - help is at hand. Here are some useful strategies to help you get unstuck.


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A great way to find out his/her ring size is to ask one of their friends. Friends occasionally have this insight, especially women. And, if the friend doesn’t know right away, she can be the one to ask (nonchalantly). Even better, ask the friend to take your girlfriend/boyfriend engagement ring shopping 'for fun'. Have her get professionally sized and ask her friend to report back to you. 

It’s best to choose a friend who you can trust not to spill the beans and preferably, someone good at acting. If you have doubts, skip this approach.


If your significant other is a heavy sleeper, you can try this creative method. Simply get a piece of string (something like this usually works well), and measure their ring finger. Make sure to mark it with a marker pen and bring that measure in during your meeting with us. We can’t guarantee they won’t wake up, so try this method at your own risk!


A great and fool proof way is to snag one of their rings for a day. You need to be careful with this method because it might backfire on you. Some of our customer success stories revolve around this method, especially if their significant other works a busy job, owns many rings or is out of town for a weekend. Make sure that you grab a ring that they wear on a similarly sized finger, the ring finger of their right hand being the optimal choice (unless, of course, they already wear a ring on their left ring finger, which is less likely). Even if you bring in a thumb ring we can usually come up with a close approximation of what size their ring finger will be. If you choose this option, make sure that you choose a ring that isn’t overly important to them and wouldn’t cause any emotional distress if she notices it missing!

Additionally, you can also try on the ring yourself and find a finger that it fits on. Be sure to take note of how and where the ring stops, and let us measure that finger when you come in.


Take one of their rings and place it on a piece of paper. Draw a circle on the inside and outside of the ring. Do this several times to make sure that your ring traces look consistent. We can usually figure out the diameter of your partner’s ring from your sketch and convert that to the appropriate ring size with some minor adjustments. Some of our customers have had success with this method!


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This method is a little more difficult, but if you are desperate, go ahead and try it out. When you are holding her hand, see if one of her fingers is similar in size to a finger of yours. For example, her ring finger might be as big as your pinky. This approach isn’t super accurate, but the more information we have on her ring size the closer we can get! We have had a few customers experience success with this method.

See Also: Our Complete Guide to Diamond Engagement Rings


There are some people in this world who like to do things the hard way, and then there are those who can be up straight. If you and your partner have been discussing marriage for some time, ask them outright what their ring size is! Don’t worry though — you can still maintain the element of surprise. After all, he or she doesn’t know when you’re going to ask, or how! If they don’t know their ring size, they can find it using our printable ring sizing guide.


  • Our dominant hands tend to be slightly bigger and so do the fingers (so make sure you are measuring for the left hand!)
  • The most common women’s ring size is US 6 to 6.5 (HK 10 to 12). Download our Ring Size Equivalent chart if you are not sure how to translate ring sizes.
  • Wider rings have a tighter fit than thinner bands, so if you borrow a ring for us to measure, try to make sure that it is the same width as the ring you plan on purchasing.
  • Check out our free ring sizer, so that you can measure the ring size in the comfort of your home!


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The two most accurate ways to confirm a ring size are to visit us to have your partner's finger size measured or have them visit a local jeweler. Using one or several of the methods above will result in a very good approximation, but there is always a small risk that it will be slightly off. Small adjustments to ring sizes can be done quickly and at minimal cost.


Check out this useful flowchart and decide on which strategy suits you best!

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Do you need guidance from a trusted diamond dealer? Let’s take this conversation further.


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Nikhil H.

Written by Nikhil H.

Digital Creator | Founder of @pprxteam | @northeastern & @startupInst Alumni |
Graduate from North Eastern University in Boston, this esports team owner is also an expert on certified diamonds. Trained at GIA, New York, Nikhil carries with him 5-years of experience in the diamond business and has a fresh, unconventional writing style that resonates with today's Gen Y and Z.

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