You've found the person you want to spend your life with, you're planning the proposal, and now there's one small detail to figure out. What's their ring size?

If you're planning a surprise proposal, finding your partner's engagement ring size without giving anything away can be tricky. Luckily, there are a few ways to find out discreetly, and if you don't get it quite right, that's okay too.

Here are our tips for finding their ring size while keeping the proposal a surprise.

BORROW A RING THEY ALREADY OWN

One of the easiest ways to find your partner's ring size is to borrow a ring they already wear.

Ideally, look for one they wear on their left ring finger. If they don't have one, a ring worn on their right ring finger can give you a starting point.

Keep in mind that finger sizes can vary between hands, so it's important to know which finger the ring usually sits on.

If you can borrow one without them noticing, bring it into our Walkerville showroom and our team can measure it for you.

Our tip: If you can't borrow the ring, try tracing the inside of it onto a piece of paper. While this won't be as accurate as measuring the ring itself, it can help us estimate their size.

ASK THEIR FRIENDS OR FAMILY

A little help from someone close to your partner can go a long way.

Their best friend, sibling or family member might already know their ring size, particularly if they've bought them jewellery before.

Alternatively, they might be able to find out discreetly by trying on rings together or bringing up the topic in conversation.

Just make sure it's someone you trust to keep the surprise!

USE A RING SIZE GUIDE

If you have access to one of your partner's rings but can't bring it into our showroom, you can use our Ring Size Guide to estimate the size at home.

In Australia, ring sizes are measured using letters, such as J, K, L and M, rather than the numerical sizing system used in the US.

Our guide includes a ring size conversion chart to help you compare measurements and find the closest Australian size.

Remember, even a small difference in measurement can affect the fit, so we'd always recommend having the size professionally checked where possible.

CHOOSE A READY TO WEAR ENGAGEMENT RING

If you haven't been able to work out their size, don't let it stop you from planning the proposal.

Our Ready to Wear Engagement Rings are available to purchase without waiting for custom manufacturing, with many of our designs stocked in size M.

Even better, our ready to wear engagement rings include one complimentary resize within the first 12 months of purchase, subject to the design.

This means you can propose with the ring you've chosen and bring it back to us afterwards to arrange the correct fit.

PROPOSE WITH A DIAMOND AND DESIGN THE RING TOGETHER

If you'd rather let your partner have a say in their engagement ring, why not choose the diamond first?

You can select a centre diamond for the proposal, then work together to create the finished ring through our Bespoke Experience.

It's a way to keep the proposal a surprise while giving your partner the opportunity to choose their setting, precious metal and finer design details.

Our team can guide you through the entire process, with your ring made in our Adelaide workshop.

WHAT IF YOU GET THE RING SIZE WRONG?

First of all, don't worry. It's very common for engagement rings purchased for surprise proposals to need a little adjustment afterwards.

If you're unsure of their size, it can sometimes be better to choose a slightly larger ring rather than one that's too small to fit over their knuckle during the proposal.

However, every ring is different, and some designs have limitations when it comes to resizing. We recommend speaking with our team before purchasing so we can help you choose a suitable size and confirm what's possible with your preferred design.

KEEP THE PROPOSAL A SURPRISE. WE'LL HELP WITH THE REST.

Finding your partner's ring size is just one small part of planning a proposal, and it shouldn't be something that holds you back.

At Class A, we've been helping couples find their engagement rings for over 50 years. Whether you know their exact size or have no idea where to start, our team can help you choose a ring and talk you through the sizing options.

Explore our Ready to Wear Engagement Rings online or visit our Walkerville showroom in Adelaide to speak with our team.

The ring can always be adjusted where the design allows. The moment you propose is what really matters.