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Ring size information & chartUpdated 2 months ago

All LOUISE JEAN engagement rings and wedding bands are handcrafted to order and can be made to any size requirements, with the exception of our ready-to-wear pieces.

Our rings are made to Australian ring sizes, based on an alphabetical scale from F - Z. These letters correlate with the internal diameter of the band, measured in millimetres. The difference from one ring size to the next is a matter of 0.2mm. The difference between a ring that fits and one that doesn’t could be just 0.4mm.

INSIDE DIAMETER (MM)
AUSTRALIAN, UNITED KINGDOM & NEW ZEALAND
UNITED STATES & CANADA
13.94
F
3
14.14
F 1/2
3 1/4
14.34
G
3 1/2
14.54
G 1/2
3 3/4
14.74
H
4
14.94
H 1/2
4 1/4
15.14
I
4 1/2
15.34
I 1/2
4 3/4
15.54
J
5
15.74
J 1/2
5 1/4
15.94
K
5 1/2
16.14
K 1/2
5 3/4
16.32
L
6
16.52
L 1/2
6 1/4
16.72
M
6 1/2
16.92
M 1/2
6 3/4
17.12
N
7
17.32
N 1/2
7 1/4
17.52
O
7 1/2
17.72
O 1/2
7 3/4
17.92
P
8
18.12
P 1/2
8 1/4
18.32
Q
8 1/2
18.52
Q 1/2
8 3/4
18.72
R
9
18.92
R 1/2
9 1/4
19.12
S
9 1/2
19.32
S 1/2
9 3/4
19.52
T
10
19.72
T 1/2
10 1/4
19.92
U
10 1/2
20.10
U 1/2
10 3/4
20.30
V
11
20.50
V 1/2
11 1/4
20.70
W
11 1/2
20.90
W 1/2
11 3/4
21.10
X
12
21.30
X 1/2
12 1/4
21.50
Y
12 1/2
21.70
Z
12 3/4
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