Diamond Ring Size Guide | Eternal Jewels

Ring Size Guide

Find your perfect fit in three easy steps. A well-fitted ring sits comfortably — snug enough not to slide off, loose enough to slide over the knuckle with slight resistance.

How to Measure Your Ring Size

Choose either method below. The string/paper method works best if you don't have an existing ring to reference.

Method 1 — String or Paper Strip

1
Cut a thin strip of paper or use a piece of string.
2
Wrap it snugly around the base of your finger — not too tight.
3
Mark where the end meets the strip, then lay it flat against a ruler.
4
Note the length in millimetres — this is your circumference.
5
Find your size in the chart below using the circumference column.

Method 2 – Existing Ring

Measure inner diameter in mm

Use inside edge to inside edge

1
Take a ring that fits the intended finger well.
2
Place it flat on a ruler or measuring tape.
3
Measure the inner diameter — inside edge to inside edge.
4
Note the measurement in millimetres.
5
Match it to the diameter column in the chart below.

Ring Size Chart

US ring sizes with corresponding circumference and inner diameter measurements.

US Size	Circumference	Inner Diameter
3	44.2 mm	14.1 mm
3.5	45.5 mm	14.5 mm
4	46.8 mm	14.9 mm
4.5	48.0 mm	15.3 mm
5	49.3 mm	15.7 mm
5.5	50.6 mm	16.1 mm
6	51.9 mm	16.5 mm
6.5	53.1 mm	16.9 mm
7	54.4 mm	17.3 mm
7.5	55.7 mm	17.7 mm
8	57.0 mm	18.1 mm
8.5	58.3 mm	18.6 mm
9	59.5 mm	18.9 mm
9.5	60.8 mm	19.4 mm
10	62.1 mm	19.8 mm
10.5	63.4 mm	20.2 mm
11	64.6 mm	20.6 mm
11.5	65.9 mm	21.0 mm
12	67.2 mm	21.4 mm
13	69.7 mm	22.2 mm