Ring Size Guide
Many ZCOOTC rings use supplier size labels such as No. 5 / 6 / 10 or open/adjustable bands. Those labels are not always the same as US, UK, or EU ring sizes. Always check the selected configuration on the product page before ordering.
How to measure at home
- Wrap a thin strip of paper or non-stretch string snugly around the base of your finger.
- Mark where the ends meet, then measure the length in millimeters — that is your finger circumference.
- Measure at the end of the day, when fingers are typically largest. Avoid measuring when hands are very cold.
- If your knuckle is much larger than the base of your finger, measure both and choose a size that can pass the knuckle comfortably.
Approximate US size reference
Use this only as a rough guide. Supplier “No.” labels may not match this chart.
| Approx. circumference | Approx. US size |
|---|---|
| ~49 mm | 5 |
| ~52 mm | 6 |
| ~54 mm | 7 |
| ~57 mm | 8 |
| ~59 mm | 9 |
| ~62 mm | 10 |
Open and adjustable rings
Open bands can be gently adjusted for a closer fit, but repeated bending can weaken the metal or plating. Adjust carefully and avoid forcing the band far beyond its natural opening. An open design does not guarantee every finger size.
When the product lists only a supplier size
If a listing shows “No. 5”, “Size 10”, or similar without a named standard (US/EU), treat it as the supplier’s own scale. Prefer adjustable styles if you are between sizes or unsure. See also our Jewelry care page for open-ring guidance.
Need help?
Email we0220002871@163.com with the product name and your finger circumference in mm — we will share whatever sizing detail the supplier listing provides.