Ring Size Guide

How to Find Your Partner's Ring Size (Without Spoiling the Surprise)

Choosing the perfect ring is unforgettable — but making sure it fits perfectly is just as important. Here’s how to find their ring size without giving away the surprise (and get it right the first time). If you're planning a surprise proposal or gift, here’s your updated guide to finding their size, with professional tips tailored for accuracy.

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The Best Way to Find Their Ring Size

The simplest way to get it right? Visit a jeweller in person for professional sizing. A jeweller will measure their finger correctly, factoring in band width, knuckle size, and any small variations between fingers. This ensures the ring fits comfortably now and in the future.

If visiting in person isn't possible, ordering an at-home ring sizing sample set is the next best option. Simply have them try on the sample rings and note which one fits best — then send us the exact sample size, and we’ll create a ring that fits perfectly. This method allows for precise measurement in the comfort of your home, without compromising the surprise.

We also offer a printable ring size guide for those measuring at home. It compares an existing ring to a size chart based on inside diameter in millimetres. While helpful, especially for discreet measurement, we recommend visiting us in person for a complimentary, professional fitting if the ring is for a significant or sentimental purchase. It's the most accurate way to ensure long-term comfort.

Download Ring Size PDF

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Why We Don't Recommend Sliding Adjustable Sizers

You might come across sliding or adjustable plastic ring sizers online. While they seem convenient, we generally advise against them. Adjustable sizers often shift or stretch as they pass over the knuckle, leading to inaccurate readings — even a half-size difference can change how a ring feels and fits, especially for engagement rings.

Taking a little extra care to use professional tools or visit a jeweller can save you time, money, and potential resizing issues down the track.

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Borrow a Ring They Already Wear

If you're aiming for a surprise, discreetly borrow a ring they wear on their left-hand ring finger. Bring it to a jeweller, or use calipers to measure the internal diameter in millimetres.

  • Measure the inside of the ring at its widest point.
  • Avoid laying the ring flat against a ruler — calipers give a much more accurate reading.
  • Confirm which finger the ring is usually worn on, as finger sizes can vary slightly even between hands.
  • Note if it feels snug or loose — this will help fine-tune the final sizing.

If they already have a ring that fits well, but it's too tricky to borrow and take to a jeweller, and you don't own calipers, there's another option. Slip the ring onto your own finger and mark exactly where the ring stops. Then, visit a jeweller and use their sizing set to find the ring that sits at the same marked spot on your finger.

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Ask Trusted Friends or Family

Close friends, siblings, or family members might already know their ring size. Or they can subtly help you find out — perhaps by borrowing a ring or organising a casual jewellery shopping trip.

Tip: Choose someone discreet who can keep the secret! Friends who already own engagement rings can be particularly helpful — they might even suggest trying on rings together "for fun," creating an easy opportunity to confirm sizing.

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Understanding Ring Sizes (Australian Sizing)

In Australia, we use an alphabetical sizing system from A to Z+. Sizes are based on the internal circumference or diameter of the ring in millimetres.

Women’s average ring size usually range from L to N.
Men’s average ring sizes usually range from R to T.

A few factors to keep in mind:

  • Fingers can swell slightly during warmer weather, after exercise, or at the end of the day.
  • Cool weather can cause fingers to contract, making rings feel slightly looser.
  • Wider bands usually feel tighter; narrower bands may feel looser.

Because of these small variations, many jewellers recommend measuring at multiple times of the day if possible, or at least in average room temperature.

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Complimentary Resizing at Carmen & Lucy Fine Jewellery

We understand that even with careful planning, a ring may occasionally need adjusting. That’s why we offer complimentary resizing for all rings within the first year of purchase. In most cases, we can adjust most rings up or down by up to three sizes with no problems. Our goal is to ensure your ring fits beautifully, preserving both comfort and craftsmanship.

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Ready to get started?

Book a consultation or order a sample sizing set today — we’re here to make your perfect moment seamless and unforgettable.

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