Find your perfect fit with our ring size guide. Learn how to measure an existing ring or your finger and use our ring size chart to find your SIS size.
Easiest method if you already own a ring that fits.


Designed to be gently adjusted for a more flexible fit. Most start at an 18mm diameter and can be increased several sizes as desired. They are handcrafted so do note repeated or excessive bending may weaken the metal or affect the shape and finish of your piece.
To adjust simply:

*Try to measure your hands at a normal temperature. If you’re measuring your ring size during cooler weather, allow a little extra room for comfort, as all fingers tend to swell in warmer conditions. Conversely, if you’re measuring in warm weather, choose a size with a snug fit to ensure the ring remains secure when temperatures drop and your fingers naturally shrink.
| SIS Inside Ring Diameter | AU/UK | EU | US | Finger Circumference |
|---|---|---|---|---|
| 16.9mm | M | 53 | 6.5 | 53.1mm |
| 17.3mm | N | 54 | 7 | 54.3mm |
| 17.7mm | O | 56 | 7.5 | 55.6mm |
| 18.1mm | P | 57 | 8 | 56.9mm |
| 18.5mm | Q | 58 | 8.5 | 58.1mm |
| 18.9mm | R | 60 | 9 | 59.4mm |
| 19.4mm | S | 61 | 9.5 | 61.0mm |
As all our pieces are handmade, so you'll see under the product descriptions the sizes that might be a fraction different to the standard size. Our open back rings allow you to change it several millimetres so they really do fit all.
If in doubt, I'm here lisa@swimminginstones.com.
Happy shopping.
Find your perfect fit with our ring size guide. Learn how to measure an existing ring or your finger and use our ring size chart to find your SIS size.
Easiest method if you already own a ring that fits.


Designed to be gently adjusted for a more flexible fit. Most start at an 18mm diameter and can be increased several sizes as desired. They are handcrafted so do note repeated or excessive bending may weaken the metal or affect the shape and finish of your piece.
To adjust simply:

*Try to measure your hands at a normal temperature. If you’re measuring your ring size during cooler weather, allow a little extra room for comfort, as all fingers tend to swell in warmer conditions. Conversely, if you’re measuring in warm weather, choose a size with a snug fit to ensure the ring remains secure when temperatures drop and your fingers naturally shrink.
| SIS Inside Ring Diameter | AU/UK | EU | US | Finger Circumference |
|---|---|---|---|---|
| 16.9mm | M | 53 | 6.5 | 53.1mm |
| 17.3mm | N | 54 | 7 | 54.3mm |
| 17.7mm | O | 56 | 7.5 | 55.6mm |
| 18.1mm | P | 57 | 8 | 56.9mm |
| 18.5mm | Q | 58 | 8.5 | 58.1mm |
| 18.9mm | R | 60 | 9 | 59.4mm |
| 19.4mm | S | 61 | 9.5 | 61.0mm |
As all our pieces are handmade, so you'll see under the product descriptions the sizes that might be a fraction different to the standard size. Our open back rings allow you to change it several millimetres so they really do fit all.
If in doubt, I'm here lisa@swimminginstones.com.
Happy shopping.
Designed for Grounding + Nourishment. An SIS state of Protect. Inspired by the ancient depth of the Daintree Rainforest, where dense canopy and layered growth create a natural sense of shelter and protection.
Shape your Shine by pairing with a Pamukkale bangle for a sense of renewal and flow.
At the heart of every creation is a magnificent natural gemstone, its meaning lending power to the overall intent of the piece.
Swimming in Stones Founder, Lisa Milner