$0.00 - Shopping Cart

You have no items in your shopping cart.

Century Diamonds - Ring Size Guide

Century Diamonds makes it simple to find the right ring size, but just in case you don't get the right size the first time around we offer free lifetime ring resizes with any order (Limit 1 per year).

 

Here are a few tools to help you find the right ring size for you:

 

1) Print & Find Your Ring Size - Print this PDF file and find your ring size. If you don't have access to a printer, let us know and we will mail this to you free of charge.

 

2) Find her ring size without her knowing! - Trying to find a significant others ring size without them knowing? Read these useful tips in our blog and find them out in no time!

 

3) International Ring Size Converter - Convert your ring size from other countries to the appropriate US ring size. See the chart below.

 

If you are still unable to determine your ring size, contact one of our customer service specialists at support@centurydiamonds.com

Use this chart to convert your local standard sizes to your US ring sizes for ordering. Choose your nearest US size. Select the US size that is nearest to yours in the dropdown menus on the product pages. Please contact us if you need assistance. 

 

U.S. Size
Diameter
in Inches
Diameter
in MM
Metric MM
Equivalent
British
French
German
Japanese
Swiss
0000
.390
9.91
 
-
 
 
 
 
00
.422
10.72
 
-
 
 
 
 
0
.454
11.53
 
-
 
 
 
 
1/2
.474
11.95
 
A
 
 
 
 
3/4
.482
12.18
 
A 1/2
 
 
 
 
1
.487
12.37
38.9
B
 
 
1
 
1 1/4
-
12.60
39.6
B 1/2
 
 
 
 
1 1/2
.503
12.78
40.2
C
 
 
 
 
1 3/4
-
13.00
40.8
C 1/2
 
 
 
 
2
.520
13.21
41.5
D
41 1/2
13 1/2
2
1 1/2
2 1/4
-
13.41
42.1
D 1/2
-
-
 
 
2 1/2
.536
13.61
42.7
E
42 3/4
13 3/4
3
2 3/4
2 3/4
-
13.83
43.4
E 1/2
-
-
 
 
3
.553
14.05
44.0
F
44
14
4
4
3 1/8
-
14.15
44.3
F 1/2
-
-
 
 
3 1/4
-
14.25
44.6
-
-
-
 
 
3 3/8
-
14.36
44.9
G
45 1/4
-
5
5 1/4
3 1/2
.569
14.45
45.2
-
-
14 1/2
 
 
3 5/8
-
14.56
45.6
G 1/2
-
 
6
 
3 3/4
-
14.65
45.9
H
46 1/2
 
 
6 1/2
4
.585
14.86
46.5
H 1/2
-
15
7
 
4 1/4
-
15.04
47.1
I
47 3/4
 
 
7 3/4
4 1/2
.601
15.27
47.8
I 1/2
-
15 1/4
8
 
4 5/8
-
15.40
48.1
J
49
15 1/2
 
9
4 3/4
-
15.53
48.4
-
-
 
 
 
5
.618
15.70
49.0
J 1/2
-
15 3/4
9
 
5 1/8
-
15.80
49.3
K
50
 
 
10
5 1/4
-
15.90
49.6
-
-
 
 
 
5 3/8
-
16.0
50.0
K 1/2
-
 
10
 
5 1/2
.634
16.10
50.3
L
51 3/4
16
 
11 3/4
5 3/4
-
16.30
50.9
-
-
 
 
 
5 7/8
-
16.41
51.3
L 1/2
-
 
 
 
6
.650
16.51
51.5
M
52 3/4
16 1/2
12
12 3/4
6 1/4
-
16.71
52.2
M 1/2
-
 
 
 
6 1/2
.666
16.92
52.8
N
54
17
13
14
6 3/4
-
17.13
53.4
N 1/2
-
 
 
 
7
.683
17.35
54.0
O
55 1/4
17 1/4
14
15 1/4
7 1/4
-
17.45
54.7
O 1/2
-
 
 
 
7 1/2
.699
17.75
55.3
P
56 1/2
17 3/4
15
16 1/2
7 3/4
-
17.97
55.9
P 1/2
-
 
 
 
8
.716
18.19
56.6
Q
57 3/4
18
16
17 3/4
8 1/4
-
18.35
57.2
Q 1/2
-
 
 
 
8 1/2
.732
18.53
57.8
-
-
18 1/2
17
 
8 5/8
-
18.61
58.4
R
59
 
 
19
8 3/4
-
18.69
58.4
-
-
 
 
 
8 7/8
-
18.80
59.0
R 1/2
-
 
 
 
9
.748
18.89
59.1
-
-
19
18
 
9 1/8
-
19.10
59.4
S
60 1/4
 
 
20 1/4
9 1/4
-
19.22
59.7
-
-
 
 
 
9 3/8
-
19.31
60.0
S 1/2
-
 
 
 
9 1/2
.764
19.41
60.3
-
-
19 1/2
19
 
9 5/8
-
19.51
60.6
T
61 1/2
 
 
21 1/2
9 3/4
-
19.62
60.9
-
-
 
 
 
10
.781
19.84
61.6
T 1/2
-
20
20
 
10 1/4
-
20.02
62.2
U
62 3/4
 
21
22 3/4
10 1/2
.797
20.20
62.8
U 1/2
-
20 1/4
22
 
10 5/8
-
20.32
63.1
V
63
 
 
23 3/4
10 3/4
-
20.44
63.5
-
-
 
 
 
11
.814
20.68
64.1
V 1/2
-
20 3/4
23
 
11 1/8
-
20.76
64.3
W
65
 
 
25
11 1/4
-
20.85
64.7
-
-
 
 
 
11 3/8
-
20.94
65.0
W 1/2
-
 
 
 
11 1/2
-
21.08
65.3
-
-
21
24
 
11 5/8
.830
21.18
65.7
X
66 1/4
 
 
26 1/4
11 3/4
-
21.24
66.0
-
-
 
 
 
11 7/8
-
21.30
66.3
X 1/2
-
 
 
 
12
.846
21.49
66.6
Y
67 1/2
21 1/4
25
27 1/2
12 1/4
-
21.69
67.2
Y 1/2
-
 
 
 
12 1/2
.862
21.89
67.9
Z
68 3/4
21 3/4
26
28 3/4
12 3/4
-
22.10
68.5
Z 1/2
-