Virtual Appointment
Back12/10/2025
You’ve nailed the location. The speech is rehearsed (sort of). The butterflies are already doing laps in your stomach. There’s just one tiny, nerve-wracking detail left before your perfect proposal… getting the ring size right.
Finding out your partner’s ring size without giving the game away can feel like a high-stakes mission, but don’t panic! It’s absolutely doable. With a bit of creativity, some subtle detective work and a touch of romance, you’ll be one step closer to the perfect “Will you marry me?”
Here are 8 fun, clever and practical ways to figure out your partner’s ring size… secretly.
If your partner already wears rings, you’re in luck.
Take a discreet look through their jewellery box and see if they own a ring that fits their ring finger (usually the left hand). If they do, you can:
Pro tip: Make sure you put the ring back exactly where you found it. Surprise is still the goal.
If you can “borrow” their ring for just a few seconds, press it into a soft bar of soap. It leaves a neat little imprint that a jeweller can use to work out the size — no guessing games needed.
A few tips:
Pro tip: Make sure you put the ring back exactly where you found it. Surprise is still the goal.
Feeling brave? This sneaky trick is surprisingly effective.
While your partner is sleeping (or very relaxed on the sofa), carefully wrap a piece of string or thin paper around their ring finger. Mark where the ends meet, then measure the length with a ruler or take it into your jeweller.
This gives you the exact finger circumference, which can be converted into the perfect ring size.
Yes, it’s a risk. Yes, it’s also kind of epic.
Your partner’s best friend might be your secret weapon.
You can ask them to:
Bonus: You can also find out your partner’s dream ring style while you’re at it. Two birds, one very shiny stone.
You can turn this into a cute, casual moment without raising alarms.
Ask to try one of their rings on your finger (or the other way around) and notice how it fits:
You can then use your own finger sizes as a reference point for the jeweller.
Not foolproof, but definitely better than guessing.
This one is genius because it feels completely innocent.
Suggest looking at jewellery for:
Get them to casually try on a few rings and make a mental note of the size that fits best. No need to buy anything. Information is the prize here.
If you manage to get hold of one of their rings for even a minute, place it on a piece of paper and quickly draw:
This gives your jeweller a visual of both the diameter and thickness, helping them estimate the correct size.
It’s simple, low-tech and surprisingly effective.
If all else fails… go symbolic.
A proposal ring is a temporary ring used for the big moment, allowing you both to later choose the perfect engagement ring together and have it sized professionally.
It doesn’t make your proposal any less romantic. In fact, it turns the next step, choosing the real ring, into an unforgettable experience you share together.
At Harmony Jewels, many couples love this option when they want the moment to stay a complete surprise but still enjoy designing their forever ring as a couple afterwards.
Relax. It happens all the time — and it’s completely fixable.
At Harmony Jewels, all of our engagement rings can be:
Most of our clients return with their partner after the proposal so we can measure their finger precisely in our Hatton Garden showroom, ensuring the final fit is absolutely perfect.
A perfect engagement ring isn’t just about the diamond or the design. It’s about comfort, wearability and symbolism — a ring that fits beautifully is one your partner will treasure forever.
That’s why at Harmony Jewels, we specialise in bespoke engagement rings and fine jewellery crafted to fit both your love story and your lifestyle. From first consultation to final sparkle, we work with personalised attention and expert craftsmanship at the heart of London’s Hatton Garden.
Whether you’re still gathering clues or you’re ready to design the ring, our expert jewellers are here to guide you every step of the way.
Book a private consultation today and let’s create something extraordinary together.