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15 Amazing Facts about Diamonds

How to Find Out Her Ring Size without Her Knowing

B. Earth

Moissanite vs. Diamond


Brilliant Earth jewelry expert Jessica Anand is frequently asked by our customers about how they can find out their girlfriend’s ring size without her knowing. Here we’ve shared some of Jessica’s best tips and tricks!

We suggest that you use one or several of these methods if you are struggling to figure out her ring size:

Be Subtle

If you are absolutely set on a surprise proposal but you still want to find out her ring size directly from the source, ask your girlfriend in a very subtle, smooth way. You can pretend, for example, that you are going to buy a ring for your mom/sister/aunt/niece etc. Make sure that this pretend recipient is someone whose hands are similar in size to your girlfriend. Casually ask what her ring size is for reference. If you really want to beef up the ruse, purchase an inexpensive ring and show it to her. Have her try it on and everything! Maybe afterward you can actually give that ring to your mom/sister/aunt/niece to appease your guilty conscience!



Ask Her Friends

A great way to find out her ring size is to ask one of her friends. Friends occasionally have this insight! 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 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 might have once had acting aspirations!

petite twisted vine


Borrow One of her Rings

Another method is to snag one of her old rings for a day. You need to be careful with this method because it might backfire on you! Make sure that you grab a ring that she wears on a similarly sized finger, the ring finger of her right hand being the optimal choice (unless, of course, she wears a ring on her 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 her ring finger will be. If you choose this option, make sure that you choose a ring that isn’t overly important to her and wouldn’t cause any emotional distress if she notices it missing!

reverie white gold


Leave a Trace

If you are terrified of losing one of her rings try this method instead. Take one of her 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 her ring from your sketch!

Lotus ring


Enlist a Friend

If one of your partner’s friends is engaged, ask her friend to let your girlfriend try on the ring. This will put you in a ballpark size range to start out with. You can also use this as an opportunity to ask what she thought of her friend’s ring (in private) and try to do a little sleuthing as to what style of ring she would like for herself.



Compare Fingers

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 method isn’t amazingly accurate, but the more information we have on her ring size the closer we can get!

waverly ring


Ask Your Partner!

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

Brilliant Earth


Keep in Mind:

The two most accurate ways to confirm ring size are to come in and have your partner sized by us in person 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 the risk that it will be slightly off.

luna ring

Please note that for custom designed rings, we highly recommend visiting a local jeweler or coming in and having her finger sized with us, as custom pieces are final sale and may not be able to be resized in the future. Err on a larger size so that it will be guaranteed to slip over her finger when you propose.

Interesting Ring Size Facts:

  • Our dominant hands tend to be slightly bigger (so make sure you are measuring for her left!)
  • The most common women’s ring size is 6 to 6.5.
  • 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.
  • Brilliant Earth is happy to ship you a free ring sizer, so that you can measure your ring size in the comfort of your home!


Brilliant Earth


What if I just can’t figure out the size?

If you simply can’t figure out the size or you don’t want to risk it, consider choosing a temporary setting to propose with. Our temporary setting is our 18K White Gold 2mm Comfort Fit Ring. You have sixty days to propose, have her properly sized, and send the ring back. Once you have her perfect size, we can set your diamond in your ideal setting.  This way she gets to see the diamond you chose, but there isn’t the risk of having to resize the actual setting. Please contact us about this option, so we can explain the exact process to you! This is also a great option for those who don’t know whether to purchase an engagement ring before or after proposing.

Good luck!


taylor1277 Says:
August 13th, 2013 at 10:16 pm

and did you know that the one thing that has measurements of the same between men and woman are ring szs.all you have to do too is measure your finger too and ask her to try on your ring.it will give you a ballpark figure also.

cluelussdumbgirl Says:
July 6th, 2014 at 11:40 am

How many of your friends know your ring size? Even better, ask the friend to take your girlfriend engagement ring shopping, REALLY? If one of your partner’s friends is engaged, ask her friend to let your girlfriend try on the ring? These are options for someone trying to buy a ring as a surprise? I have another one for you. Take your girlfriend to a wedding dress store and have her try one on, you know “for fun”. Then rent a white limo and drive her to a big church and have her walk down the isle, again just “for fun”. You see where this is going? Surprise…………………….

Scarlet Says:
October 8th, 2014 at 12:37 pm

How about… I dunno, taking a ring she wears a lot and trace it on a piece of paper. (Inside of the circle and out)

Emily Says:
December 20th, 2014 at 9:45 pm

Why not just have one of her friends say something like hey can I borrow that ring its so pretty and being a good friend shed say yea but just give it back and BOOM you have a ring size

Bebe Says:
December 31st, 2014 at 2:33 pm

There is one way not listed here…. Try on one of her rings. Make a mental note of where it stops on your finger. Go to a jeweler and try on sizer rings until one hits the same spot on your finger. There you go.

David Says:
April 25th, 2015 at 8:45 pm

Find a pic (or take one in secret – perhaps while she’s sleeping) of her hand next to an object that can easily be measured. Then, in photoshop or some other image edit application, find the ratio between the object diameter and her finger diameter and multiply that by the diameter of the object. Once you know the diameter it’s just a simple calculation to get the circumference (pi x D). Obviously, for best results get as close as possible and use the best camera you can find.

Ruben Fernandez Says:
May 19th, 2015 at 9:29 am

I would like a free ring sizer please.
Send to:
Ruben Fernandez
6624 El Parque Dr.
El Paso, TX. 79912

asIF Says:
June 8th, 2015 at 10:36 pm

I read somewhere else that you can take a ring you know fits her and press it into a bar of soap. Take the soap to a jeweler.

Gavin Says:
June 28th, 2015 at 8:11 pm

My girlfreind is kind of a tomboy. She rarely ever wears jewelery other than the necklace i got her e while ago. Plus i don’t know what she’ll like. If she had a sister i would go to her, but her mom has about the same size hands… lol just because i posted this i now know what to do!

Hans Says:
June 30th, 2015 at 10:15 am

I have a suggestion for all of you. How about you’ll all stop throwing your life away like that. Marriage these days is nothing but a business proposition – one that has the guy on the losing end of it. Are you really willing to do that? And then feel guilty for figuring out her ring size when you’re about to blow $50k on some carbon-based blingy stone?

Patrick Says:
September 3rd, 2015 at 8:42 am

Hans…. sounds like you might have lost in love….. whether or not that’s true, don’t be so negative to the rest of us because of your experience….

Diane Says:
November 16th, 2015 at 11:08 am

And now for the best answer…..her ring size is the same as her shoe size……(minus the narrow or wide). I know this sounds strange, but to my knowledge, this has always held true. So when she isn’t looking, check out one of her shoes…????

Joel Says:
December 9th, 2015 at 10:40 pm

Who cares !

Johnbate Says:
February 15th, 2016 at 8:54 pm

I am currently working in a differnt country.
My questions are:
1. Does it make sense if I send the ring despite we’re faraway to each other?
2. Which other way can I know her ring size apart from the listed ones above?

B. Earth Says:
February 16th, 2016 at 3:07 pm

Hi John,

If you are far away from her, you could ask one of her friends or family members for her ring size. If none of them know it, you could also enlist a friend or family member back home to try on one of her rings to compare ring sizes. Good luck! Our jewelry specialists would love to help you with any further questions and can be reached by calling 800.691.0952.

Nancy Drew Says:
March 8th, 2016 at 9:39 am

Please let her pick her own ring! I got an awful ring. The store wouldn’t take it back. A $3,000 ring spent 15 years in a drawer until it was pilfered by a cleaning lady!

Nancy Drew Says:
March 8th, 2016 at 9:47 am

Please let her pick her own ring. My ring was so awful. The store wouldn’t take it back and the owner showed me 3 even worse ones. The 3,000 ring stayed in a drawer for 15 years until the cleaning lady stole it. It should be a Class A Felony to allow an unescorted man into a jewelry store!

Emsgirl Says:
March 29th, 2016 at 6:14 am

NancyDrew you could have sold it if you really wanted. You should be grateful you even got a ring and that someone would marry you!! Some of us aren’t that lucky!!

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