Buying a ring as a gift is one of the most romantic and thoughtful gestures you can make — but the fear of getting the size wrong puts many people off. The good news? There are several clever ways to find out her ring size without spoiling the surprise, and even if you get it slightly wrong, it's usually easy to fix. Here's everything you need to know.
Why Ring Size Matters
A ring that's too tight is uncomfortable and can be difficult to remove. One that's too loose risks slipping off and getting lost. Getting the size right — or close to right — makes the gift feel considered and personal. But don't let the fear of getting it wrong stop you from buying a ring — most sterling silver rings can be resized by a jeweller.
How to Find Her Ring Size Without Asking
1. Borrow One of Her Existing Rings
This is the most reliable method. If she already wears rings, borrow one from her jewellery box — ideally one she wears on the finger you're buying for. Take it to a jeweller who can measure the internal diameter and give you the size. Make sure you borrow a ring she wears on the correct finger (ring finger on the left hand for most engagement and dress rings).
2. Trace the Ring on Paper
If you can't take the ring to a jeweller, place it on a piece of paper and trace the inside of the band. The diameter of the circle will help you determine the size. Most ring size charts are available online and match diameter (in mm) to ring size.
3. Ask Her Friends or Family
A trusted friend or family member may already know her ring size — or be willing to find out discreetly on your behalf. This is a great option if you want to keep the surprise but need accurate information.
4. Use the "While She's Sleeping" Method
Carefully wrap a thin strip of paper around her finger while she's asleep, mark where it overlaps, and measure the length. This gives you the circumference of her finger, which you can convert to a ring size using an online chart.
5. Pay Attention to What She Says
Many people mention their ring size in passing — when trying on rings in a shop, or when talking about jewellery. If you're paying attention, you may already have the information you need.
6. Make an Educated Guess
If all else fails, make an educated guess based on her build. The average UK women's ring size is N (US size 7). Petite women tend to be smaller (L–M), while larger-framed women may be O–P or above. When in doubt, go slightly larger — it's easier to resize a ring down than up.
UK Ring Size Guide
For reference, here are the most common UK women's ring sizes and their approximate internal diameters:
- J — 15.9mm (very small)
- L — 16.7mm (small)
- N — 17.5mm (average)
- P — 18.3mm (larger)
- R — 19.1mm (large)
What If You Get the Size Wrong?
Don't panic — it happens to the best of us. Most sterling silver rings can be resized by a professional jeweller, usually within a few days and at a modest cost. At Turquoise Jewellery, our London repair workshop offers ring resizing as a standard service — so even if the size isn't perfect, we can fix it quickly and affordably.
Note: rings with stones set all the way around (like eternity rings) are more difficult to resize, so these are best avoided unless you're confident of the size.
The Safest Ring Styles to Buy as a Gift
If you're genuinely unsure of her size, consider these styles that are more forgiving:
- Open or adjustable rings — these can be gently adjusted to fit
- Slim bands — easier to resize than wide bands
- Rings without stones all the way around — simpler to resize than full eternity styles
Shop Sterling Silver Rings
Browse our beautiful range of sterling silver rings — from delicate stacking rings and classic bands to statement CZ rings and elegant eternity styles. All crafted from genuine 925 sterling silver, beautifully packaged, and delivered free across the UK. The perfect gift, whatever the occasion.