How to Find Her Ring Size Without Spoiling the Surprise

The short answer: the easiest way to find her ring size without asking is to borrow a ring she already wears on the correct finger and measure it, or trace it, while she's not around. Three methods below, plus what to do if you get it wrong.

1. The Ring Swap

Borrow a ring she already wears on the finger you're buying for - it has to be that finger, since sizes differ from hand to hand and even finger to finger. Trace the inside circle onto paper, or measure the inside diameter in millimetres with a ruler. If you can get it to a jeweller (or measure it against our printable ring size guide), even better - just put it back exactly where you found it before she notices.

2. The String (or Floss) Trick

If you can't borrow a ring, this works while she's asleep or distracted. Wrap a piece of string, thread or dental floss snugly around the base of the correct finger, mark where it overlaps, then lay it flat and measure the length in millimetres. Compare that measurement against a ring size chart to convert it to a size. It's less precise than measuring an actual ring, but close enough to get a well-fitting gift, especially if you size up slightly for comfort.

3. Enlist an Accomplice

Her mother, sister, best friend or a co-worker she trusts almost always knows her ring size, or can find out without raising suspicion - "we're doing a spa day, do you know your ring size for the henna/photos?" is a classic cover story. This is usually the fastest and most accurate method if you have someone willing to help keep the secret.

Two Things Worth Knowing Before You Buy

Fingers are slightly smaller in the morning and swell a little through the day, so a measurement taken first thing can run small. If you can, measure or borrow the ring in the evening for the truest read. And if the ring you're choosing has a wider band, it will generally fit more snugly than a thin band in the same size - sizing up half a size is usually the safer call for chunkier styles.

What If You Get It Wrong?

It happens more often than you'd think, and it isn't the disaster it feels like in the moment. Reach out to our team before or after gifting and we'll talk you through resizing where possible, so the size guess doesn't have to be perfect - just close.

Once you have a number to work with, our full ring collection is organised by style, so you can browse stacking rings, statement pieces and everyday bands with confidence.

Frequently Asked Questions

What's the most accurate way to find someone's ring size in secret?

Borrowing a ring she already wears on the correct finger and measuring its inside diameter is the most accurate method, since it reflects her actual finger rather than an estimate.

Do ring sizes differ between fingers and hands?

Yes. The same finger can measure differently on the left and right hand, and different fingers on the same hand are rarely the same size, so always measure the specific finger the ring is meant for.

Should I size up or down if I'm unsure?

Sizing up slightly is generally the safer guess - a ring that's a touch loose can be resized down more easily than one that's too tight, and can be worn on a chain in the meantime.

What if the ring doesn't fit?

Contact our team - we're always glad to talk through resizing options so a size that's slightly off doesn't get in the way of the gift.