SIZE GUIDE

We know it can be a bit nerve-wracking choosing your ring size online - fit is important! But from what we’ve seen, fingers are pretty forgiving. A well measured size will usually still feel great even if it’s half a size above or below your “perfect” fit. So if your measurements are on point, you’re all set.

Finding Your Ring Size

The most reliable way to find your ring size is by popping into a jewellery store for a quick measurement. But if that’s not an option, you can easily figure it out from home using just a piece of paper or string:

  1. Wrap it around your finger where you plan to wear the ring, keeping it snug but comfortable.

  2. Mark the point where the ends meet.

  3. Measure the length from end to mark in millimetres (this is your finger’s circumference).

  4. Match it up with our size chart below to find your ring size, feel free to drop your exact measurements in the box ‘ADD YOUR SIZE MEASUREMENTS’ provided to allow me to build your ring to your exact sizing.

A Note on Fit

We know choosing the right size online can feel like a bit of a gamble—but don’t stress. Most fingers can comfortably wear a size above or below their ideal size, so if your measurement is close, you're likely in the right zone. Precision helps, but there’s a little wiggle room.

Tips & Tricks

  • Every finger is different. Make sure you measure the exact finger you’ll wear the ring on.

  • The paper or string should slide over your knuckle comfortably (just in case you ever do want to take the ring off!).

  • For the most accurate result, measure twice.

  • If you’re between sizes, choose the closest one and leave a note in the box provided requesting a half size e.g., if you're between N and O, request N½.

Need further help? Email us at cosajewellery@gmail.com

COSA is a tribute

A BIT ABOUT US

COSA was born from a love of rings and a desire to create something that felt true -  true to who I am, and true to those who mean the most to me. The name COSA is a tribute, with each letter representing someone deeply important in my life. It’s personal. It’s grounded. And that’s exactly what I want every piece to feel like.

For as long as I can remember, I’ve loved rings - but not the kind that dominates the market. I’ve never been into delicate, dainty styles. I wanted something with substance. Something solid. Something you can feel. A piece that carries weight, both in craftsmanship and meaning.

When I started looking for rings that fit that description, I kept running into the same problem: too feminine, too flimsy, too mass-produced and rarely made here in Australia. And while I noticed there were more options under the label of "men's rings," even those felt boxed in by outdated ideas of gender.

COSA was built to fill that gap. A place for quality, unlabelled rings that are made to be worn by anyone. No gender rules. No fast fashion. Just good design, solid materials, and local craftsmanship.

COSA is proudly Australian made, and always will be. I’m committed to creating high-quality pieces that last; rings with character, integrity, and intention. Whether it's a statement ring or a piece you wear every day, COSA is about self-expression, without compromise.

Thanks for being here.

- Olivia, COSA