Ring Size Guide
We now offer US sizes 4–10 across all women’s rings, and 8–13 in our men’s collection. All our rings follow standard US sizing.
At the moment, we don’t offer half sizes – but we’ve included a sizing guide below to help you find your best fit.
If your size isn’t available, we’d love to hear from you. Please get in touch via our contact page – we’re always open to expanding our range based on customer feedback.
| Diameter (mm) |
Circumference (mm) |
US | UK | Europe |
| 14.9 | 46.8 | 4 | H½ | 47 |
| 15.7 | 49.3 | 5 | J½ | 49.3 |
| 16.5 | 51.9 | 6 | L½ | 51.9 |
| 17.3 | 54.5 | 7 | N½ | 54.4 |
| 18.1 | 57 | 8 | P½ | 57 |
| 18.9 | 59.5 | 9 | R½ | 59.5 |
| 19.8 | 62.1 | 10 | T½ | 62.1 |
| 20.6 | 64.6 | 11 | V½ | 64.6 |
| 21.4 | 67.2 | 12 | X½ | 67.2 |
Sizing & Support
Need sizing help or advice on keeping it a secret? Email us at info@thepromiseco.com and we can help you figure out a ring size.
We recommend ordering a standard ring sizer from Amazon, they usually look like a key chain with lots of metal rings. Once you've got your size you can use our handy guide below to convert it, or email us for help.
Use our size guide to find your perfect fit
If you need personalised support on picking the perfect ring, email our team at info@thepromiseco.com and we will do our best to support.
Alternatively, shop our E-Gift cards, for the perfect fit, everytime.
At The Promise Ring Co. we are committed to providing you with
exceptional service and ensuring that your purchase of your ring is a truly special and sentimental experience. We understand that these pieces aren't just jewellery; they are symbols of love, commitment, and cherished moments.
That's why we stand by our products and offer a 2-year guarantee to give you peace of mind.
For full warranty terms click here
We understand accidents happen and we know how precious all our pieces are to each customer.
Email us a picture of the damage to info@thepromiseco.com and we will do our best to support you with solutions
Looking for the perfect gift for your last minute woes, shop our E-gift cards for the perfect fit, everytime.
Discover
How to make your promise:
CHOOSE A RING
Every order comes with a Promise Card, your space to write down your words and make your promise real
WRITE IT DOWN
Choose a one of our Pieces to signify your Promise. This could be a Promise to yourself, a friend Or loved one.
MAKE IT OFFICIAL
Post your promise to Promise World... where your words live alongside others, each one part of something bigger
