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Antique Jewelry - Estate and Vintage

jewellers - diamond dealers - appraisers - restorers

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Antique and Vintage Jewellery Lecture:

Global Ring Size Guide

Various systems are employed globally to denote jewellery ring sizes:

United States and Canada: Ring sizes follow a numerical scale, including quarter and half sizes. Each full-size increment corresponds to an increase of 0.032 inches (0.8128 mm) in diameter or approximately 1/10 inch (2.55 mm) in inner circumference.
Europe (excluding Ireland and the UK): Ring sizes are based on a numerical scale, which also includes half sizes.
Ireland, United Kingdom, and Australia: Ring sizes are designated using an alphabetical scale, which also includes half sizes.
Japan: Ring sizes follow a numerical scale that includes only whole sizes.
Switzerland: Ring sizes are based on a numerical scale that includes quarter and half sizes.
Germany: Ring sizes are measured by the internal diameter in millimetres, following the ISO standard.
ISO Standard: The international standard for ring sizes, ISO 8653, defines sizes based on the ring's inner circumference, measured in millimetres.

At Adin Fine Vintage & Antique Jewellery, we carefully assess ring sizes to help our clients find the perfect fit, no matter the sizing system used. If you are unsure about your ring size, we are happy to assist you in finding the best fit for your chosen piece.

For guidance on how to measure your ring size, click here.

Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
			0	11.54	36.25
a				11.90	37.38
		0		12.00	37.70
a½				12.10	38.01
b				12.30	38.64
			1	12.37	38.86
b½				12.50	39.27
			1¼	12.58	39.52
c				12.70	39.90
	0.15		1½	12.78	40.15
c½	0.53			12.90	40.53
	0.84	1	1¾	13.00	40.84
	1.00			13.05	41.00
d	1.15			13.10	41.15
	1.50		2	13.21	41.50
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
d½	1.78			13.30	41.78
	1.88	2		13.33	41.88
	2.00			13.37	42.00
	2.13		2¼	13.41	42.13
e	2.41			13.50	42.41
	2.76		2½	13.61	42.76
	2.91	3		13.66	42.91
e½	3.00			13.69	43.00
	3.42		2¾	13.82	43.42
f	3.67			13.90	43.67
	3.98	4		14.00	43.98
	4.00			14.01	44.00
	4.14		3	14.05	44.14
f½	4.30			14.10	44.30
	4.74		3¼	14.24	44.74
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
g	4.92			14.30	44.92
	5.00			14.32	45.00
	5.02	5		14.33	45.02
	5.40		3½	14.45	45.40
g½	5.55			14.50	45.55
	6.00			14.64	46.00
	6.02		3¾	14.65	46.02
	6.06	6		14.66	46.06
h	6.18			14.70	46.18
	6.68		4	14.86	46.68
h½	6.81			14.90	46.81
	7.00			14.96	47.00
	7.12	7		15.00	47.12
	7.34		4¼	15.07	47.34
i	7.44			15.10	47.44
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	7.97		4½	15.27	47.97
	8.00			15.28	48.00
i½	8.07			15.30	48.07
	8.16	8		15.33	48.16
	8.63		4¾	15.48	48.63
j	8.69			15.50	48.69
	9.00			15.60	49.00
	9.20	9		15.66	49.20
j½	9.32		5	15.70	49.32
k	9.95		5¼	15.90	49.95
	10.00			15.92	50.00
	10.27	10		16.00	50.27
k½	10.58		5½	16.10	50.58
	11.00			16.23	51.00
l	11.24		5¾	16.31	51.24
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	11.30	11		16.33	51.30
l½	11.87		6	16.51	51.87
	12.00			16.55	52.00
	12.34	12		16.66	52.34
m	12.46			16.70	52.46
	12.56		6¼	16.73	52.56
	13.00			16.87	53.00
m½	13.09			16.90	53.09
	13.16		6½	16.92	53.16
	13.41	13		17.00	53.41
n	13.72			17.10	53.72
	13.85		6¾	17.14	53.85
	14.00			17.19	54.00
n½	14.35			17.30	54.35
	14.44	14		17.33	54.44
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	14.51		7	17.35	54.51
o	14.98			17.50	54.98
	15.00		7¼	17.56	55.00
	15.48	15		17.66	55.48
o½	15.61			17.70	55.61
	15.76		7½	17¾	55.76
	16.00			17.83	56.00
p	16.23			17.90	56.23
	16.45		7¾	17.97	56.45
	16.55	16		18.00	56.55
p½	16.86			18.10	56.86
	17.00			18.14	57.00
	17.15		8	18.19	57.15
q	17.49			18.30	57.49
	17.59	17		18.33	57.59
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	17.77		8¼	18.39	57.77
	18.00			18.46	58.00
q½	18.12			18.50	58.12
	18.40		8½	18.59	58.40
	18.62	18		18.66	58.62
r	18.75			18.70	85.75
	19.00		8¾	18.78	59.00
r½	19.38			18.90	59.38
	19.66		9	18.99	59.66
	19.69	19		19.00	59.69
s	20.00			19.10	60.00
	20.38		9¼	19.22	60.38
s½	20.63			19.30	60.63
	20.73	20		19.33	60.73
	20.98		9½	19.41	60.98
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	21.00			19.42	61.00
t	21.26			19.50	61.26
	21.67		9¾	19.63	61.67
	21.76	21		19.66	61.76
t½	21.89			19.70	61.89
	22.00			19.74	62.00
	22.33		10	19.84	62.33
u	22.52			19.90	62.52
	22.83	22		20.00	62.83
	23.00		10¼	20.05	63.00
u½	23.15			20.10	63.15
	23.59		10½	20.24	63.59
v	23.77			20.30	63.77
	23.87	23		20.33	63.87
	23.99			20.37	63.99
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	24.28		10¾	20.46	64.28
v½	24.40			20.50	64.40
	24.91	24		20.66	64.91
	24.97		11	20.68	64.97
w	25.00			20.69	65.00
	25.60		11¼	20.88	65.60
w½	25.66			20.90	65.66
	25.97	25		21.00	65.97
	26.00			21.01	66.00
	26.22		11½	21.08	66.22
x	26.29			21.10	66.29
x½	26.92		10¾	21.30	66.92
	27.01	26		21.33	67.01
y	27.51		12	21.49	67.51
	28.02			21.65	68.02
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
	28.05	27		21.66	68.05
y½	28.20		12¼	21.71	68.20
z	28.77		12½	21.89	68.77
	28.99			21.96	68.99
	29.12	28		22.00	69.12
z½	29.43			22.10	69.43
	29.49		12¾	22.12	69.49
z+1	29.99			22.28	69.99
	30.15	29	13	22.33	70.15
z+1½	30.69			22.50	70.69
	30.81		13¼	22.54	70.81
	31.00			22.60	71.00
	31.19	30		22.66	71.19
z+2	31.31			22.70	71.31
	31.47		13½	22¾	71.47
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
z+2½	32.01		13¾	22.92	72.01
	32.26	31		23.00	72.26
z+3	32.57			23.10	72.57
	32.76		14	23.16	72.76
	33.01			23.24	73.01
z+3½	33.20			23.30	73.20
	33.32			23.34	73.32
	33.29	32		23.33	73.29
	33.42		14¼	23.37	73.42
z+4	33.83			23.50	73.83
	33.98		14½	23.55	73.98
	34.33	33		23.66	74.33
z+4½	34.46			23.70	74.46
	34.71		14¾	23.78	74.71
	34.99			23.87	74.99
Great Britain	Europe	Japan	USA	diameter mm	circumf. mm
z+5	35.08			23.90	75.08
	35.40	34	15	24.00	75.40
z+5½	35.71			24.10	75.71
	36.00		15¼	24.19	76.00
z+6	36.34			24.30	76.34
	36.43	35		24.33	76.43
	36.69		15½	24.41	76.69
z+6½	37.00			24.51	77.00
	37.31		15¾	24.61	77.31
	37.47	36		24.66	77.47
z+7	37.60			24.70	77.60
	38.00		16	24.83	78.00
z+7½	38.23			24.90	78.23
	38.54	37	16¼	25.00	78.54


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Antique and Vintage Jewellery Lecture:

Global Ring Size Guide

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