Buying a ring for someone special is one of the most exciting (and nerve-wracking!) experiences. Whether it’s for an engagement, anniversary, birthday, or “just because,” you want everything to be perfect — especially the fit. But here lies the challenge: how do you find the right ring size without ruining the surprise?
The good news is that with a little planning and some clever tactics, you can figure out their size discreetly. In this guide, we’ll walk you through the best ways to measure ring size secretly, tips for common mistakes, and what to do if you’re unsure.
Why Ring Size Matters
Unlike necklaces or bracelets, rings don’t have much flexibility in sizing. A ring that’s too tight is uncomfortable, while one that’s too loose risks slipping off and getting lost. When you’re planning a surprise — especially a proposal — making sure the ring fits comfortably is part of creating a memorable moment.
Clever Ways to Find the Right Ring Size (Without Them Knowing)
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1. Borrow a Ring They Already Own
One of the simplest tricks is to borrow a ring your partner already wears on their ring finger. Take it to a jeweller (like us at T.H. Baker) who can quickly measure it.
Tip: Make sure the ring you borrow is worn on the correct hand and finger. The dominant hand is usually slightly larger.
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2. Ask Their Friends or Family
If you have a trusted ally, enlist the help of a friend, sibling, or parent. Chances are, they may already know your partner’s ring size — or can casually bring it up in conversation without suspicion.
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3. Compare Fingers
If you can’t borrow a ring, try slipping one of their rings onto your own finger and marking where it sits. A jeweller can then use that as a size reference.
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4. Trace or Measure in Secret
Place one of their rings flat on a piece of paper and trace around the inside. This outline can be compared against a ring size chart later.
Alternatively, use a ruler to measure the inside diameter in millimetres. Most jewellers can match that to the correct UK ring size.
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5. Go for the Average Size (and Resizing Options)
If all else fails, choose the average ring size. In the UK, the most common women’s size is L–N, while men typically fall around R–T.
If you’re unsure, choosing the average size is a safe bet. And don’t worry too much — many rings can be adjusted after purchase. However, some styles, like eternity bands or highly detailed designs, may not allow for resizing. That’s why it’s always worth asking your jeweller for guidance before making your final choice.
At T.H. Baker, our experts can guide you on which styles are resizable, and which may need to be ordered in the right size from the start.
Custom-Made Rings: The Perfect Backup Plan
Still nervous about getting the size wrong? Why not design a ring that’s as unique as your love story? With our Custom Engagement Ring Builder and Custom Wedding Ring Builder, you can create a one-of-a-kind piece and have it adjusted later if needed.
One of the advantages of creating a custom ring is that you can design with the future in mind. Our team will help you select styles that are easier to resize later, giving you flexibility if the initial size isn’t perfect. If you prefer intricate bands or eternity rings that can’t be resized, we’ll ensure they’re made in the exact size you need from the start.
Not only does this guarantee a personalised design, but it also ensures peace of mind if the ring size isn’t exact the first time.
Common Mistakes to Avoid
- Guessing wildly – You risk buying a ring that’s too small or large.
- Forgetting about finger differences – Fingers can change size between hands and even with temperature.
- Not checking return/exchange policies – Always make sure you’re buying from a jeweller who offers resizing or exchanges (like T.H. Baker).
Extra Discreet Tricks
- Buy a ring sizer online and test it while they’re asleep (risky, but possible if they’re a heavy sleeper!).
- Take them “window shopping” and casually get them to try on rings under the guise of helping you.
- Use a string or piece of paper wrapped gently around their finger (just don’t get caught!).
Final Thoughts
Choosing the right ring size without spoiling the surprise might feel daunting, but with these simple tricks, you can pull it off smoothly. Remember, it’s the thought, effort, and love behind the gesture that makes it special.
And don’t stress too much if the size isn’t perfect right away — many rings can be resized depending on their design.
At T.H. Baker, we’re here to help you find (or create) the perfect ring that symbolises your love story. Browse our wide range of engagement rings, wedding bands, and timeless jewellery pieces to make your surprise truly unforgettable.
