Ring size guide

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Our ring sizes are the inside circumference of the ring, in millimetres. A size 56 therefore measures 56 mm around the inside, not across.

How to find your size

Take a ring that already fits the right finger, measure its inside diameter in millimetres, then multiply by 3.14. That gives our size directly. A jeweller can also measure the finger and give you the circumference in millimetres.

International conversion

Opalook size (mm)	Inside diameter	UK	US
48	15.3 mm	I 1/2	4 1/2
50	15.9 mm	K	5 1/2
52	16.6 mm	L 1/2	6
54	17.2 mm	N	7
56	17.8 mm	P	7 1/2
58	18.5 mm	Q 1/2	8 1/2
60	19.1 mm	S	9
62	19.7 mm	T 1/2	10
64	20.4 mm	V	10 1/2
66	21.0 mm	X	11 1/2
68	21.6 mm	Y 1/2	12

Some models also exist in in-between sizes. Available sizes are listed on each product page.