Free Shipping / Free Returns / 1 Year Warranty / 0% APR Finance

SUBSCRIBE TO OUR NEWSLETTER TO GET 15% OFF YOUR FIRST ORDER

Free Shipping / Free Returns / 1 Year Warranty / 0% APR Finance

Diamonds & Co
ring-size-guide-banner

Ring Size Guide

View our ring size chart, request a free ring sizer and learn how to find your ring size at home

Home/Education/ Ring Size Guide

Ring Size Guide

When buying a ring, whether for yourself or someone else, it’s important to get the size right. After all, you don’t want to spoil that special moment when presenting the ring to a loved one only to find out that the ring is too big or too small. Rings shouldn’t be so loose they can fall off, or so tight they’re hard to take off.

Complimentary Ring Resizing

We hope you are happy with your chosen ring, but should your ring not fit perfectly we are happy to offer one free ring sizing for each purchased ring. The size can be adjusted up or down by a maximum of two ring sizes. Please note that not all rings can be sized, and this information is conveyed at the point of order.

ring-size guide

Request a Free Ring Sizer

How to Use Your Complimentary Ring Sizer

The multi sizer ring tool is marked alphabetically with finger sizes from A through to Z+9.

It works in the same way as a belt!

Simply feed the end through the loop to form the basis of your circular ring shape. As you feed more of the end through, the size will become smaller. Once you think you are approaching your ring size, slip the sizer over the knuckle of the finger to be measured before refining the adjustment. Remember for a good fit, your ring should slide over your knuckle with relative ease when putting on but should meet with a little resistance when taking off.

Take time to experiment with this!

When you are confident your ring fits correctly, take note of the letter the arrow is pointing towards on the ring sizer, and this is your ring size!

Tips on measuring your finger size.

Remember, your finger size can fluctuate even over the course of a day. We recommend measuring your ring size at different times of the day to establish your average finger size.

how to Use Your Complimentary Ring Sizer

Ring size chart

Inside Circumference

mm

in

UK, AUS, IRE, NZ, SA

USA, CAN, MEX

FRA

GER, RUS, UKR, ASIA

IT, SPA

IND, CHI, JAP, S.AME, TUR, ISR

44.2

44.8

45.5

46.1

46.8

47.4

48

48.7

49.3

50

50.6

51.2

51.9

52.5

53.1

53.8

54.4

55.1

55.7

56.3

57

57.6

58.3

58.9

59.5

60.2

60.8

61.4

62.1

62.7

63.4

64

64.6

65.3

65.9

66.6

67.2

68.1

68.5

69.1

69.7

1.74

1.77

1.79

1.82

1.84

1.87

1.89

1.92

1.94

1.97

1.99

2.02

2.04

2.07

2.09

2.12

2.14

2.17

2.19

2.22

2.24

2.27

2.29

2.32

2.34

2.37

2.39

2.42

2.44

2.47

2.49

2.52

2.54

2.57

2.59

2.62

2.64

2.67

2.69

2.72

2.75

F

F 1/2

G

G 1/2

H

H 1/2

I

J

J 1/2

K

K 1/2

L

L 1/2

M

M 1/2

N

N 1/2

O

O 1/2

P

P 1/2

Q

Q 1/2

R

R 1/2

S

S 1/2

T

T 1/2

U

U 1/2

V

V 1/2

W

W 1/2

X

X 1/2

Y

Z

Z 1/2

-

3

3.25

3.5

3.75

4

4.25

4.5

4.75

5

5.25

5.5

5.75

6

6.25

6.5

6.75

7

7.25

7.5

7.75

8

8.25

8.5

8.75

9

9.25

9.5

9.75

10

10.25

10.5

10.75

11

11.25

11.5

11.75

12

12.25

12.5

12.75

13

44

44.625

45.25

45.875

46.5

47.125

47.75

48.375

49

49.625

50.25

50.875

51.5

52.125

52.75

53.375

54

54.625

55.25

55.875

56.5

57.125

57.75

58.375

59

59.625

60.25

60.875

61.5

62.125

62.75

63.375

64

64.625

65.25

65.875

66.5

67.125

67.75

68.375

69

14

14.25

14.5

14.75

15

15.25

15.5

-

15.75

16

16.25

-

16.5

16.75

17

-

17.25

17.5

17.75

-

18

18.25

18.5

18.75

19

19.25

19.5

19.75

20

20.25

20.5

-

20.75

-

21

-

21.25

21.5

21.75

-

22

4

4.625

5.25

5.875

6.5

7.125

7.75

8.375

9

9.625

10.25

10.875

11.5

12.125

12.75

13.375

14

14.625

15.25

15.875

16.5

17.125

17.75

18.375

19

19.625

20.25

20.875

21.5

22.125

22.75

23.375

24

24.625

25.25

25.875

26.5

27.125

27.75

28.375

29

4

-

5

6

7

-

8

-

9

-

10

11

12

-

13

-

14

-

15

-

16

-

17

-

18

-

19

-

20

21

22

-

23

-

24

-

25

-

26

-

27

Typical Women’s Ring Sizes in the UK

J
48.7MM

K
50MM

L
51.2MM

M
52.5MM

N
53.8MM

O
55.1MM

P
56.3MM

Q
57.6MM

Ring Size Frequently Asked Questions

Share your #MyDiamondsAndCo favourite looks

Join our community of jewellery lovers and share the forever piece that tells your story.

181375255005898421790254376146816618323248231263392183584499702091771804106066061818418114788537490466
178574653986752351812302628473917318109664737971443181672529954534241811564891887047917853534987696722
D&Co logo
instagram iconfacebook icon
©2026 All Rights Reserved | Diamonds & Co London
Credit subject to status and affordability. Terms & Conditions Apply. Charming International Limited trading as Diamonds & Co is not a lender. Credit is subject to status and affordability, and is provided by Mitsubishi HC Capital UK PLC.