SDE ring size guide

How to find your ring size

Your ring size can be measured physically by SDE in our store with highly accurate tools. At home you can also measure the inner diameter of a ring that already fits your finger with a caliper to esimate your size.

Diameter is the measurement across the inner width of a ring, going from one side to the other.

Diameter	EU	UK	US
14 mm	44	f1/2	3
14.6 mm	46	h	3.75
15.3 mm	48	h1/2 - i1/2	4.5
15.6mm	49	j	4.75
16 mm	50	j-k	5
16.2mm	51	k1/2	5.5
16.5 mm	52	l - l1/2	6
16.9mm	53	m	6.5
17.2 mm	54	m1/2 - n1/2	7
17.5 mm	55	o	7.25
17.8 mm	56	o - p	7.5
18.1 mm	57	p	8
18.5 mm	58	p1/2 - q1/2	8.5
18.8 mm	59	r	8.75
19 mm	60	r1/2 - s	9
19.8 mm	62	t1/2	10
20.4 mm	64	v	10.5

Sizing Tips

For stackable and wider (5mm+) ring-shanks we recommend one size larger than your normal ring size.

How to measure the circumference of a ring:

Cut a string that is about 6 inches long.
Fold the string around the base of the finger, just below the knuckle.
Mark where the string ends with the pen.
Place the measured string on the ruler with the area marked on your right.<br>
The number closest to the pen mark is the circumference of the ring in millimeters.<br>