How to Find Your Perfect Ring Size

At Ura Atelier (based in Spain), we use theSpanish ring sizing system, measured by the inner diameter and circumference of the ring. Refer to our size conversion chart to match your measurement (down bellow).
For the Most Accurate Fit:
Visit a local jeweler: Professional sizing is highly recommended, as DIY methods (string/paper) often lead to inaccuracies.
Consider the ring’s design: Wider or textured bands may require sizing up by one or two sizes—a knowledgeable jewelry store assistant can guide you through this process. If you still are unsure, please contact me.
Half/full sizes? We offer them at no extra cost. Select the nearest standard size at checkout and note your exact preference in "Order Notes."
Key Tips:
Timing matters: Measure your finger at the end of the day, at rest, and in a temperate climate (heat/swelling can alter size).
Hand dominance: Your dominant hand’s fingers are slightly larger— so keep this in mind when choosing where will you place your ring.
Seasonal changes: Some bodies change more than others during the seasons, so if this is your case, you might want to consider having seasonal rings according to your body.
Band width: Thicker bands fit tighter; size up if choosing a thicker design.
Custom Sizes:
Need a size outside our standard range? Contact us for a custom order (nominal fee applies).

** Thicker Ring
In this case, you will need to size up due to the thickness of the ring to allow for a comfortable movement of your finger.
What matters is the thickness all the way around. If your ring is only big on the front, it will not affect the sizing result.
Big ring but thin band
This is an example of how a ring only big on the front won't affect your sizing.

Spain | UK/AUS | US/CAN | France | Italy | Germany | Switzerland | Japan | Diameter (mm) | Circumference (mm) |
---|---|---|---|---|---|---|---|---|---|
5 | E ½ | 4.75 | 45.5 | 5.5 | 15 ¾ | 5.5 | 7 | 14.68 | 46.1 |
6 | F ½ | 5.75 | 46.5 | 6.5 | 16 ¼ | 6.5 | 8 | 15.10 | 47.4 |
7 | G ½ | 6.75 | 47.5 | 7.5 | 16 ¾ | 7.5 | 9 | 15.51 | 48.7 |
8 | H ½ | 7.75 | 48.5 | 8.5 | 17 ¼ | 8.5 | 10 | 15.92 | 50.0 |
9 | I ½ | 8.75 | 49.5 | 9.5 | 17 ¾ | 9.5 | 11 | 16.33 | 51.3 |
10 | J ½ | 9.75 | 50.5 | 10.5 | 18 ¼ | 10.5 | 12 | 16.74 | 52.6 |
11 | K ½ | 10.75 | 51.5 | 11.5 | 18 ¾ | 11.5 | 13 | 17.15 | 53.9 |
12 | L ½ | 11.75 | 52.5 | 12.5 | 19 ¼ | 12.5 | 14 | 17.56 | 55.2 |
13 | M ½ | 12.75 | 53.5 | 13.5 | 19 ¾ | 13.5 | 15 | 17.97 | 56.4 |
14 | N ½ | 13.75 | 54.5 | 14.5 | 20 ¼ | 14.5 | 16 | 18.38 | 57.7 |
15 | O ½ | 14.75 | 55.5 | 15.5 | 20 ¾ | 15.5 | 17 | 18.79 | 59.0 |
16 | P ½ | 15.75 | 56.5 | 16.5 | 21 ¼ | 16.5 | 18 | 19.20 | 60.3 |
17 | Q ½ | 16.75 | 57.5 | 17.5 | 21 ¾ | 17.5 | 19 | 19.61 | 61.6 |
18 | R ½ | 17.75 | 58.5 | 18.5 | 22 ¼ | 18.5 | 20 | 20.02 | 62.9 |
19 | S ½ | 18.75 | 59.5 | 19.5 | 22 ¾ | 19.5 | 21 | 20.43 | 64.2 |
20 | T ½ | 19.75 | 60.5 | 20.5 | 23 ¼ | 20.5 | 22 | 20.84 | 65.5 |