How to Find Her Ring Size Without Ruining the Surprise

Planning a surprise proposal means solving one practical puzzle: how do you get a ring that fits without asking the one question that gives everything away? Here are the methods that actually work.

Borrow a ring she already wears

The gold standard. Take a ring she wears on her ring finger (left hand if possible) and trace its inside circle on paper, or measure its inside diameter with a ruler. Our Ring Size Guide converts that measurement straight to an Australian size. Rings worn on other fingers can still help as a starting point; just tell us which finger it came from.

Recruit an accomplice

A sister, best friend or mum can often get the answer for you, whether they simply know it, or engineer a casual ring try-on at a market stall. One well-briefed accomplice beats a dozen guesses.

The sleeping measurement

It is a classic for a reason: a piece of string or paper gently around the finger while she sleeps. Riskier, and less accurate than borrowing a ring, but couples have pulled it off for generations.

Or skip the guesswork entirely

Here is the option most jewellers do not offer: at Aura, you can simply choose "Select Later" when ordering. Propose with confidence, then after the yes, we confirm her exact size together before the ring is crafted. Because every ring is made to order, the ring she wears forever is made precisely for her finger from day one. No resizing compromise, no spoiled surprise.

One last tip

Fingers change with temperature, so if you do measure, do it in the evening. And whatever method you choose, our Melbourne team is one chat message away for a second opinion, 11am to 7pm Monday to Saturday. Explore engagement rings when you are ready to make it official.