How to know the size

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1. Select an existing ring that fits the desired finger.
2. Measure the inner diameter of the ring in mm.
3. Select the diameter below to determine your ring size.

Inner diameter	Portuguese scale	French scale	American Scale
14.9mm	7	47	4
15.3mm	8	48	4 1/2
15.5mm	9	49
15.9mm	10	50	5
16.3mm	11	51	5 1/2
16.5mm	12	52	6
16.9mm	13	53	6 1/2
17.3mm	14	54	7
17.5mm	15	55
17.9mm	16	56	7 1/2
18.2mm	17	57	8
18.5mm	18	58	8 1/2

Use a scale to measure the inside diameter:

size guide