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How to Measure Ring Size Without Your Partner Knowing

Brilliant Earth jewelry expert Jessica Anand is frequently asked by our customers about how to measure ring size without their partner knowing. Here we’ve shared some of Jessica’s best tips and tricks!

Request a Free Ring Sizer Tape Measure

We are happy to send you a complimentary plastic ring sizer so that you can easily measure your ring size at home. A plastic ring sizer shipped to the US and Canada will arrive within five to seven business days and delivery time to Australia may take longer.


1. Be Subtle

If you are absolutely set on a surprise proposal but you still want to find out their ring size directly from the source, ask your significant other in a very subtle, smooth way. If you’re proposing to your girlfriend, you can pretend, for example, that you are going to buy a ring for mom/sister/aunt/niece or even yourself. Make sure that this pretend recipient is someone whose hands are similar in size to your partner. 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 them. Have them try it on and everything to see if it is a comfort fit and the correct size. Maybe afterward you can actually give that ring to your mom/sister/aunt/niece to appease your guilty conscience!


2. Ask Their Friends

A great way to find out your partner’s ring size is to ask one of their friends. Friends occasionally have this insight! And, if the friend doesn’t know right away, he or she can be the one to ask (nonchalantly). Even better, ask the friend to take your partner engagement ring shopping “for fun.” Have them get professionally sized so that you know if your partner fits standard ring sizes or is more fit for a half size. It’s best to choose a friend who might have once had acting aspirations!


3. Borrow One of Their Rings

Another method is to snag one of their 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 your partner wears on a similarly sized finger, the ring finger of their right hand being the optimal choice. 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 they notice it missing!

4. Leave a Trace

If you are terrified of losing one of their rings try this method instead. 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 and can indicate the proper ring size. We can usually figure out the inner diameter of their ring from your sketch!


5. Enlist a Friend

If one of your partner’s friends is engaged, ask the friend to let your partner 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 they thought of their friend’s engagement ring (in private) and try to do a little sleuthing as to what style of ring your partner would like for themselves.


6. Compare Fingers

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


7. 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 them outright what their ring size is! Don’t worry though— you can still have the element of surprise. After all, they don’t know when you’re going to ask, or how! If your partner doesn’t know their ring size, they can find it using our printable ring sizing guide.


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.


Please note that for custom designed rings, we highly recommend visiting a local jeweler or coming in and having their 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 the ring finger when you propose.

Interesting Ring Size Facts:



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 your partner properly sized, and send the ring back. Once you have their perfect size, we can set your diamond in your ideal setting.  This way they get 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. You can also chat with a Brilliant Earth representative live using the chat feature on the website for more assistance.

Good luck!

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Comments (74)

Ellen H Singel Says:
April 25th, 2019 at 8:47 am

My fiance took me to a ring store in the mall “spontaneously” and asked them to size me “for fun”, then he didn’t propose for another year and a half. Very tricky!

robin pittis Says:
March 26th, 2019 at 4:09 am


Lita Moore Says:
January 24th, 2019 at 7:20 pm

What can I do to help out

Eder R Estudillo Says:
August 17th, 2018 at 12:46 pm

The ring sizer is a great idea

Dayle Rounds Says:
August 14th, 2018 at 10:03 am

Thank you for your offer of the free ring sizer.

Jan Beckwith Says:
July 26th, 2018 at 4:36 pm

Would like to have one of your ring sizers.

Claudia Says:
July 23rd, 2018 at 6:23 pm

Love your rings please send me a ring sizer Thanks

Timmy Says:
June 14th, 2018 at 2:11 pm

Thanks for having me.

Angela Lang Says:
May 13th, 2018 at 9:47 pm

Requesting a free ring sizer. Please send asap.

Angela Lang Says:
May 13th, 2018 at 9:46 pm

Please send me a ring sizer asap

Tony Jilnicki Says:
May 5th, 2018 at 8:32 pm


Christopher Olivera Says:
March 24th, 2018 at 8:45 am

Requesting free Ring Sizer, thanks!!!

Joshua Says:
March 10th, 2018 at 3:07 pm

Thanks you very much

Joshua Says:
March 10th, 2018 at 3:07 pm


joel a Says:
March 6th, 2018 at 6:08 pm


vincent elwick Says:
February 27th, 2018 at 3:43 pm

can i have a ring sizer

jose taboada Says:
February 27th, 2018 at 12:19 pm

will propose on april 21 2018

B. Earth Says:
February 19th, 2018 at 11:16 am

Hi Zach, we offer one complimentary resizing for our standard ring styles with free shipping both ways within 60 days of shipment to our US, Canadian, UK, and Australian customers. Please note our eternity rings cannot be resized due to their design. Custom, modified, and engraved rings are subject to resize fees. You can find more information on our return and exchange policies here: Thanks for your interest!

Zach DeGuzman Says:
February 15th, 2018 at 11:23 am

What’s the return policy for wrong size rings?

AARON McCauley Says:
January 31st, 2018 at 8:08 pm

I’d like a ring finger sizer

Kane Millikan Says:
January 16th, 2018 at 9:40 pm

Thank you for ring sizer

Jeff Siebenthall Says:
December 27th, 2017 at 10:43 am


Robin Garcia Says:
December 4th, 2017 at 9:44 pm

Request ring sizer

B. Earth Says:
November 29th, 2017 at 11:15 am

Hi Timothy, please fill out the form on the top of this page by clicking “Request Ring Sizer”. If you are having trouble, please contact our jewelry specialists at 1.800.691.0952 or through the live chat on our site. Thanks for your interest!

B. Earth Says:
November 29th, 2017 at 11:15 am

Hi Chad, please fill out the form on the top of this page by clicking “Request Ring Sizer”. Thanks for your interest!

Timothy Says:
November 16th, 2017 at 7:18 am

How do I request a ring sizer? When I try to enter myself in, it doesn’t do anything.

CHAD M Says:
November 15th, 2017 at 7:51 pm

Can you send me a ring sizer

april torres Says:
November 10th, 2017 at 2:30 pm

thank you

B. Earth Says:
October 27th, 2017 at 11:14 am

Hi Shari, you can get a ring sizer sent to you by filling out the form at the top of this post. Just click “Request Ring Sizer”. Thanks for reaching out!

Andrew Says:
October 27th, 2017 at 6:36 am


Shari Bishop Says:
October 25th, 2017 at 11:20 am

Looking for a ring sizer please

Laurence La Roux Says:
October 19th, 2017 at 5:36 am

Just taking a look

B. Earth Says:
October 18th, 2017 at 11:57 am

Hi Robert, you can request a free ring sizer by filling out the form at the top of the blog post. Thanks for your interest!

robert s corry Says:
October 17th, 2017 at 11:03 am

please send free ring sizer

B. Earth Says:
October 12th, 2017 at 1:57 pm

Hi Andrew, the form on the blog works. If you have any questions on the status of your ring sizer delivery please reach out to or call us at 18006910952. Thanks for your interest!

Andrew Says:
October 12th, 2017 at 6:53 am

Hope this is the actual button to submit my info for y’all to send out the ring sizer…

Tyren Jones Says:
October 7th, 2017 at 5:29 pm


Kenneth Huffman Says:
September 26th, 2017 at 4:36 pm

I think this is a cool thing been wondering how to check her ringo size without her knowing

Cody Says:
September 21st, 2017 at 4:13 pm


Wolf Weisz Says:
September 15th, 2017 at 1:36 pm


David Says:
August 24th, 2017 at 6:25 pm

Ring sizer please

Justin wilkett Says:
August 7th, 2017 at 7:20 am

Thank you

Darren Says:
July 24th, 2017 at 1:39 pm

Or, if your girl is into scented candles, tell her it’d be fun to get her one of the “candles with a ring in them” (FragrantEarth, etc.) and tell her you need her ring size to order it. It’s not quite as obvious a move as buying a ring all by itself, since it’s about the candle as much as the ring. Worked for me!

Erick espinoza Says:
May 26th, 2017 at 10:42 am

Trying to propose without anyone knowing or saying anything

Benedict Doorly Says:
April 2nd, 2017 at 6:40 pm

Totally believe this – its not always easy to
get points such as this across but you’ve done an admirable job to your readers

Dacia Elder Says:
March 10th, 2017 at 3:14 pm

I haven’t checked in here for some time since I thought it was getting
boring, but the lst few posts are great quality
so I guess I will addd yyou back to my everyday bloglist.
You deserve it friend 🙂

Stephen Celeste Says:
February 26th, 2017 at 2:34 am

And yeah, discuss rings early in the relationship, then file the info for later use, if possible. That way, you’ll also know the styles she likes and if she has certain expectations of size or doesn’t even care for diamonds, etc.

Stephen Celeste Says:
February 26th, 2017 at 2:30 am

Actually, the ring size/shoe size thing does typically hold true… Except it’s your size in MEN’S shoes! (Usually about two sizes smaller than your typical women’s shoe size). Also, bear in mind that “fashion” shoes, like similar clothing, tend to vary somewhat wildly in sizing, so it’s best to use a winter boot or athletic shoe for this purpose. Good luck!

Planned ring, surprise proposal Says:
February 16th, 2017 at 12:10 am

Nancy Drew is right. Let her pick the ring. She’s going to wear this on her hand ever day for the rest of her life.

You can still make the proposal a surprise, with or without the ring.

Or a “surprise” will ruin what should be a happy time.

Derek Fischer Says:
February 1st, 2017 at 12:36 am

Ihave r??d so many posts ?oncerning the blogger lovers but this paragraph is really a good p?ece of ?riting, keep it up.

Cassandra Says:
November 8th, 2016 at 2:27 pm

I’m dreaming. These rings are beautiful and would look perfect on my size 7.5 finger.

Mrs Sydlar Says:
August 26th, 2016 at 2:10 pm

Im sorry but I hate that everyone is dictating about others opinions. Whether or not its true. I know that my husband asked me on our third date. He asked, Baby, what kind of rings do you like? I answered. When I was in Walmart with him I tried on some of their rings and that’s when he got my ring size. All that youran has to do is be a spy, really. He’ll surprise with your ring. Mine wasn’t expensive. I know that a woman on here said she hated her ring. If its a 3,000$ ring I wouldn’t hate it. Mine was really cheap. I’m sorry but it shouldn’t matter how much it is. What should matter was that he became brave enough to ask you for your hand. My husband for the longest time has put himself down for buying me a cheap ring. I have told him that I love him and that’s all.

Tony Says:
August 23rd, 2016 at 8:49 pm

I came here hoping to leave with some insight. The first two suggestions are really awful ?

Pamela Says:
July 10th, 2016 at 8:22 am

Why not offer to buy her a small promise ring of greater things to come. I know I LOVED my promise ring when I got it, but if she is eager, she will give you the facts you need!

Emily Says:
June 12th, 2016 at 4:50 pm

I work in jewelry and I can tell you that women’s shoe sizes have NOTHING to do with ring sizes.
Myself as an example wear a 5.75 ring and a 9.5 shoe. If I tried to wear a 9.5 ring on my ring finger it would fall off

Nobody Girl Says:
June 12th, 2016 at 4:24 pm

The shoe vs ring is NOT TRUE… I wear a size 8 shoe and a 6 ring. No.

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!!

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!

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!

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.

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?

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

Who cares !

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…????

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….

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?

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!

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.

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

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.

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.

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

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)

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…………………….

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 will give you a ballpark figure also.

How to Find Her Ring Size Without Her Knowing | Brilliant Earth