Ring Size Guide

Use the conversion chart before ordering custom gemstone rings, then confirm final fit and setting details with the team.

International Ring Size Conversion Chart

India, US/Canada, UK/Australia/New Zealand, France, Germany, and Italy/Spain/Netherlands/Switzerland reference.

India / China / Japan	Diameter (mm)	Circumference (mm)	USA / Canada	UK / AU / NZ	France	Germany	IT / ES / NL / CH
1	13	41	1	B	--	--	--
2	13.4	42	2	D	41 1/2	13 1/4	1 1/2
3	13.7	43	2 1/2	E	42 3/4	13 3/4	2 3/4
4	14	44	3	F	44	14	4
5	14.3	45	3 1/2	G	45 1/4	14 1/2	5 1/4
6	14.6	46	3 3/4	G 1/2	45 7/8	14 3/4	5 7/8
7	15	47	4	H 1/2	46 1/2	15	6 1/2
8	15.3	48	4 1/2	I 1/2	47 3/4	15 1/2	7 3/4
9	15.6	49	5	J 1/2	49	15 3/4	9
10	15.9	50	5 1/2	K 1/2	50 1/4	16 1/4	10 1/4
11	16.2	51	5 3/4	L	50 7/8	---	10 7/8
12	16.5	52	6	L 1/2	51 1/2	16 1/2	11 1/2
13	16.8	53	6 1/2	M 1/2	52 3/4	17	12 3/4
14	17.2	54	7	O	54	17 1/4	14
15	17.5	55	7 1/2	P	55 1/4	17 3/4	15 1/4
16	17.8	56	8	Q	56 1/2	18	16 1/2
17	18.1	57	8 1/2	R	57 3/4	18 1/2	17 3/4
18	18.4	58	9	S	59	19	19
19	18.8	59	9 1/2	---	60 1/4	20	20 1/4
20	19.1	60	10	T 1/2	61 1/2	20	21 1/2
21	19.4	61	10 1/4	U	62 1/8	20 1/4	20 1/8
22	19.7	62	10 1/2	U 1/2	62 3/4	20 1/2	22 3/4
23	20	63	11	V 1/2	64	20 3/4	24
24	20.3	64	11 1/2	W 1/2	65 1/4	21	25 1/4
25	20.6	65	12	Y	66 1/2	21 1/4	26 1/2
26	21	66	12 1/2	Z	67 3/4	21 3/4	27 3/4
27	21.3	67	13	Z 1/2	69	22	29

Curating certified treasures

Use the conversion chart before ordering custom gemstone rings, then confirm final fit and setting details with the team.

India, US/Canada, UK/Australia/New Zealand, France, Germany, and Italy/Spain/Netherlands/Switzerland reference.

India / China / Japan	Diameter (mm)	Circumference (mm)	USA / Canada	UK / AU / NZ	France	Germany	IT / ES / NL / CH
1	13	41	1	B	--	--	--
2	13.4	42	2	D	41 1/2	13 1/4	1 1/2
3	13.7	43	2 1/2	E	42 3/4	13 3/4	2 3/4
4	14	44	3	F	44	14	4
5	14.3	45	3 1/2	G	45 1/4	14 1/2	5 1/4
6	14.6	46	3 3/4	G 1/2	45 7/8	14 3/4	5 7/8
7	15	47	4	H 1/2	46 1/2	15	6 1/2
8	15.3	48	4 1/2	I 1/2	47 3/4	15 1/2	7 3/4
9	15.6	49	5	J 1/2	49	15 3/4	9
10	15.9	50	5 1/2	K 1/2	50 1/4	16 1/4	10 1/4
11	16.2	51	5 3/4	L	50 7/8	---	10 7/8
12	16.5	52	6	L 1/2	51 1/2	16 1/2	11 1/2
13	16.8	53	6 1/2	M 1/2	52 3/4	17	12 3/4
14	17.2	54	7	O	54	17 1/4	14
15	17.5	55	7 1/2	P	55 1/4	17 3/4	15 1/4
16	17.8	56	8	Q	56 1/2	18	16 1/2
17	18.1	57	8 1/2	R	57 3/4	18 1/2	17 3/4
18	18.4	58	9	S	59	19	19
19	18.8	59	9 1/2	---	60 1/4	20	20 1/4
20	19.1	60	10	T 1/2	61 1/2	20	21 1/2
21	19.4	61	10 1/4	U	62 1/8	20 1/4	20 1/8
22	19.7	62	10 1/2	U 1/2	62 3/4	20 1/2	22 3/4
23	20	63	11	V 1/2	64	20 3/4	24
24	20.3	64	11 1/2	W 1/2	65 1/4	21	25 1/4
25	20.6	65	12	Y	66 1/2	21 1/4	26 1/2
26	21	66	12 1/2	Z	67 3/4	21 3/4	27 3/4
27	21.3	67	13	Z 1/2	69	22	29