Size Guide

This sizing guide is here not only for our Singularity carbon rings but also serves as a universal guide for flat-profile rings in general.

The world of ring sizing can be tricky – we’re here to make it as simple as possible. EU ring sizes differ by just one third of a millimeter (0.3 mm), and yet you can definitely feel the difference. That’s how sensitive human fingers are.

Let’s start with three possible situations:

  1. I have a reference ring

  2. I’ve tried to measure my size with ring sizers (at home or in a jewelry store)

  3. I’ve used alternative methods like tape, paper, etc.

1. How to measure your current ring

Take your ring and measure its inner diameter using a caliper – this gives the most accurate result. If you don’t have a caliper, use a ruler and try to measure as precisely as possible (ideally to half millimeters).

Then, when using a size chart, always round the result up.

If your current ring has a thin and rounded profile, you’ll need to add some size to comfortably wear a flat-profile ring.

Examples:
A) My ring has a round profile and I measured 16 mm / EU 50:

  • Add 2 sizes for comfortable wear of flat 2 mm and 4 mm ring → EU 52

  • Add 3 sizes for a 6 mm ring → EU 53

  • Add 4 sizes for a 10 mm ring → EU 54

B) My ring has a flat profile and I measured 16 mm / EU 50:

  • If you're planning to get a ring of similar width, stick with your measured size

  • If you're getting a significantly narrower ring, subtract 1 size

  • If you're getting a significantly wider ring, add 1 size

2. How to measure with ring sizers

Whether you're measuring your fingers at home or in a jewelry store, keep these tips in mind:

  1. Measure in the evening – Fingers are usually a bit swollen from the day’s activities, so you'll get a more realistic fit.

  2. Find the right fit – The ring should slide smoothly over the knuckle, sit comfortably at the widest part, and not feel tight when bending your finger. The ring is not tight—there’s a slight space on each side that allows your skin to breathe and accommodates natural swelling.

  3. Removing the ring – It should come off with a little resistance, but not be loose.

  4. For tapered fingers – Choose a size that fits snugly at the base but still feels okay when bending your finger.

  5. If you're in a jewelry store, try on a ring with a similar profile and width to what you're planning to buy.

Different sizers = different approach

Examples:

A) I have round-profile ring sizers. Same case as if you had a round-profile reference ring: Measured size 16 mm / EU 50.
→ Add 2 sizes for our 2 mm and 4 mm ring → EU 52
→ Add 3 sizes for 6 mm → EU 53
→ Add 4 sizes for 10 mm → EU 54

B) I have flat-profile ring sizers (usually 3 mm wide): Measured size 60 EU.
→ For 2 mm and 4 mm rings – go with the measured size: EU 60
→ Add 1 size for 6 mm → EU 61
→ Add 2 sizes for 10 mm → EU 62

Note:

Metal ring sizers “slide” better on the finger than carbon – there's less friction. If you're hesitating between two sizes and you're buying a carbon ring, go for the larger one.

Also, if you're measuring in colder months, remember that in summer or after physical activity, fingers swell a little.
Never choose a size that already feels tight when trying it on.

3. What about measuring with string, tape, or paper?

Let’s be honest:

  • String or cord → nope, highly inaccurate.

  • Paper → maybe, just to get a very rough idea.

  • Plastic ring sizer tapes → similar to paper. They might give you a rough estimate, especially if you're trying to find a size for multiple fingers. But if you need a precise size for one specific finger, these methods aren’t reliable enough.

  • Apps on phones or tablets → just no. We've tried — really tried — and never got good results.

Where to next?