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Asterion

Find your fit

Size Guide

Ring sizing varies slightly by design. Use the methods below to find your size before ordering. Exchanges are available, but takes time.

Two Ways to Measure

01

Measure Your Finger

Wrap a strip of paper or thin string around the base of your finger. Mark where it overlaps, then measure the length in millimetres. That is your circumference.

Measure at the end of the day when fingers are slightly larger.
02

Measure An Existing Ring

Place a ring you already own flat on a ruler. Measure the inner diameter in millimetres, then use the chart below to find your size.

Use a ring that fits your target finger, not a thumb or pinky ring.

Size Chart

US / CA UK Diameter (mm) Circumference (mm) EU
7N17.354.454
8P18.257.257
9 CommonR19.059.760
10 CommonT19.862.162
11 CommonV20.664.665
12X21.467.267
13Z22.269.770

Things to Keep in Mind

Temperature

Fingers swell in heat and shrink in cold. Size at room temperature for the most accurate fit.

Band Width

Wider bands fit tighter. If a ring is 8mm or wider, consider sizing up by half a size.

Knuckle Size

If your knuckle is noticeably larger than the base, size for the knuckle so the ring can slide on comfortably.

Still unsure? We are happy to help you find the right size before you order.

Ask Us