How to Find Her Ring Size Without Spoiling the Surprise
You've found the ring. You've planned the moment. But there's one detail quietly keeping you up at night: what if it doesn't fit?
Getting her ring size right without tipping her off is one of the most common challenges of proposing — and one of the most searched questions online. The good news: there are several reliable ways to nail the sizing without breathing a word. Here's what actually works.
Why Ring Size Matters More Than You Think
Most engagement rings can be adjusted after the fact, so if you're slightly off, it's not the end of the world. But getting it right from the start means she can wear it the moment she says yes — to show off at dinner, call her family, take the photos. That first moment wearing the ring is worth the extra care.
The average women's ring size in Canada is around a 6 or 7, but "average" means very little when you're buying for one specific person. Ring sizes vary based on finger shape, dominant hand, temperature, and even time of day (fingers can swell slightly in heat or by the evening). The goal isn't an average — it's her actual size.
6 Ways to Find Her Ring Size Without Her Knowing
1. Borrow One of Her Existing Rings
This is the most reliable method by far. If she wears rings on her ring finger — even occasionally — borrow one she hasn't reached for in a while. Take it to a jeweler to measure the inner diameter, or trace the inside of the band onto paper and bring that with you.
A few things to get right:
- Make sure you're borrowing a ring she wears on her ring finger specifically — not her index finger or pinky. Sizes vary significantly between fingers, sometimes by two full sizes.
- If you can't take the ring out of the house, press it gently onto a bar of soap to make a clean impression, or trace the circle as accurately as you can.
- Return it to exactly where you found it before she notices it's gone.
If she doesn't wear rings regularly, check her jewelry box. An old gift ring or even a costume piece worn on the right finger can give you a working measurement.
2. The String or Paper Strip Method
When borrowing a ring isn't an option, a thin strip of paper or piece of string can work as a low-tech alternative. While she's asleep or occupied, gently wrap the strip around the base of her ring finger, mark where it meets, then measure the length in millimetres.
Quick size reference for Canadian sizing:
- 47–49 mm → Size 4–4.5
- 50–52 mm → Size 5–5.5
- 53–55 mm → Size 6–6.5
- 56–58 mm → Size 7–7.5
- 59–61 mm → Size 8–8.5
This method has a small margin for error depending on how snugly you wrap, so if you're caught between two sizes, go slightly larger — it's generally easier to adjust a ring that's a touch too big than one that's too small.
3. Recruit a Trusted Friend or Family Member
Her best friend, sister, or mom is almost certainly already in on your proposal plans anyway. Ask them to find out her ring size naturally — they can suggest trying on jewelry together, browse rings online with her, or ask directly under the guise of shopping for themselves.
Close friends are usually surprisingly good at keeping secrets when they know a proposal is coming. Just make sure whoever you ask can genuinely stay quiet — you know her circle better than anyone.
4. Ring Sizing Apps
Several free apps let you measure ring size using a coin as a reference point or by placing an existing ring on the screen to measure its diameter. These work reasonably well as a starting estimate, though they're slightly less precise than an in-person measurement with a jeweler's mandrel.
Use a sizing app to confirm a number you've arrived at through another method, rather than relying on it as your only reference point. Combined with the string method or a borrowed ring, you'll have a solid cross-check.
5. Pay Attention to Clues She's Already Given You
Has she ever tried on a ring at a store and mentioned it was a little loose or tight? Did a gifted ring not quite fit right? These offhand comments are useful data. People often forget they've said these things; write them down when you hear them.
You can also look at her other fingers for a general sense of proportion — though ring size varies significantly between fingers, so treat this as directional context rather than a measurement.
6. When in Doubt, Size Up
If you've done your research and you're still genuinely unsure, lean toward the larger size. A ring that's slightly too big can be worn temporarily with a ring size adjuster (a small, inexpensive clip available at most jewelry stores), and a jeweler can resize a ring to fit properly after the proposal.
The one outcome to avoid is going significantly too small — trying to force a ring onto a finger isn't the moment you want preserved in proposal photos.
All Sizes Are Available — Made to Order
One thing that removes some of the pressure: every ring in the Toronto Fine Jewelry Engagement Rings collection is available across the full ring size range. Each piece is handcrafted to order in our Vaughan studio, which means you're not limited to whatever's sitting in stock — whatever size you need, we make it that way.
When you select a ring like The Ava 3-Stone Ring or The Annie Oval Cut Ring, you'll find a full size selector on the product page. If you're proposing soon and genuinely uncertain, choose your best estimate — the ring can be adjusted to the right fit after the moment has happened.
If you'd prefer to talk through sizing before placing your order, reach out to us directly — this comes up constantly and we're happy to help you think it through before you commit.
The Short Version
The most reliable method is always a borrowed ring — but the string trick combined with a trusted friend covers most situations where that isn't possible. When in doubt, go slightly larger. And remember: even if the fit is slightly off, the proposal itself is what she'll remember. The ring can be adjusted. The moment can't.
Ready to find the one? Browse 371 handcrafted engagement ring designs, made in Canada, starting at $1,050 CAD.