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At Wonderfully Diamonds, we understand that you may not know the ring size of your signaficate other, and we have created this ring size guide to help you.

Things To Consider To Get The Correct Size

The ring should be snug so that it doesn't slide off the finger, but not too small so that it doesn't get stuck at the knuckle. The best time to measure your finger size is in the evening, when the fingers are warm. It is advised to measure finger size 3 or 4 times to get the most accurate reading. 

Measuring For A Surprise Proposal

If you are planning a secret proposal, you can get a good idea of your partner's ring size by measuring a ring she already owns, make sure it is for the correct finger. If your measurement is between two ring sizes, it is best to go with the bigger size.

If your purchase is not confidential, you can get the correct ring size via:

  • Go to your local jewellery store and have the finger size measured

  • Visit our showroom (strictly by appointment) for an accurate finger size measurement and consultation.

Still Not Sure Of The Ring Size?

If you are unable to find out your partner's ring size before purchase, please simply select "Not Sure" at Ring Size option and proceed with your purchase. Please contact us so we can discuss the best option for you. We can either send you a free ring sizer so you can measure the finger size yourself, or we can make the ring a standard ring size (between L - M). Once you get the correct size, you can send it back to us for a free resize. You have to do so within the 14 days return policy and within three sizes of the standard L - M size (Please refer to our Terms & Condition page for more details).

Sign Up For A Free Ring Sizer Gauge

Fill in the form below to request your free ring sizer gauge. We will send it to you via first class post. Your email address will be added to our weekly newsletter list to allow you to receive exclusive offers, free guides and jewellery information. Your information provided will not be shared with any third party. You will have the option to unsubscribe at any time. 

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*Free ring sizing gauge available for UK postal addresses only

Need to get the ring resized? No problem! Click here to find out our Free Ring Resizing policy.

Ring Size Chart

UK

USA

GERMAN/FRENCH

ITALIAN

RING CIRCUMFERENCE (MM)

RING DIAMETER (MM)

 

 

38.00

 

 

 

A

 

39.00

 

37.70

12.00

A 1/2

 

39.50

 

38.33

12.20

B

 

40.00

 

38.96

12.40

B 1/2

0.75

40.80

 

39.58

12.60

C

1.25

41.25

 

40.53

12.90

C 1/2

1.50

41.00

1.00

41.15

13.10

D

1.75

42.00

2.00

41.78

13.30

D 1/2

2.00

42.50

2.50

42.41

13.50

E

2.25

43.50

3.50

43.04

13.70

E 1/2

2.50

44.00

4.00

43.67

13.90

F

2.75

44.50

4.50

44.30

14.10

F 1/2

3.00

45.00

5.00

44.92

14.30

G

3.25

45.50

5.50

45.55

14.50

G 1/2

3.50

46.00

6.00

46.18

14.70

H

3.75

47.00

7.00

46.81

14.90

H 1/2

4.00

47.50

7.50

47.44

15.10

I

4.25

48.00

8.00

48.07

15.30

I 1/2

4.50

48.50

8.50

48.69

15.50

J

4.75

49.50

9.50

49.32

15.70

J 1/2

5.00

50.00

10.00

49.95

15.90

K

5.25

50.50

10.50

50.58

16.10

K 1/2

5.50

51.00

11.00

51.21

16.30

L

5.75

52.00

12.00

51.84

16.50

L 1/2

6.00

52.50

12.50

52.46

16.70

M

6.25

53.00

13.00

53.09

16.90

M 1/2

6.50

54.00

14.00

53.72

17.10

N

6.75

54.50

14.50

54.35

17.30

N 1/2

7.00

55.00

15.00

54.98

17.50

O

7.25

55.75

15.75

55.61

17.70

O 1/2

7.50

56.25

16.25

56.23

17.90

P

7.75

57.00

17.00

56.86

18.10

P 1/2

8.00

57.25

17.25

57.49

18.30

Q

8.25

58.00

18.00

58.12

18.50

Q 1/2

8.50

58.50

18.50

58.75

18.70

R

8.75

59.50

19.50

59.38

18.90

R 1/2

9.00

60.00

20.00

60.00

19.10

S

9.25

60.50

20.50

60.63

19.30

S 1/2

9.50

61.25

21.25

61.26

19.50

T

9.75

62.00

22.00

61.89

19.70

T 1/2

10.00

62.50

22.50

62.52

19.90

U

10.50

63.00

23.00

63.15

20.10

U 1/2

10.50

64.00

24.00

63.77

20.30

V

10.75

64.25

24.25

64.40

20.50

V 1/2

11.00

65.00

25.00

65.03

20.70

W

11.25

65.50

25.50

65.66

20.90

W 1/2

11.50

66.50

26.50

66.29

21.10

X

11.75

67.00

27.00

66.92

21.30

X 1/2

12.00

67.50

27.50

67.54

21.50

Y

12.25

68.00

28.00

68.17

21.70

Y 1/2

12.50

69.00

29.00

68.80

21.90

Z

12.75

69.50

29.50

69.43

22.10

Z 1/2

13.00

70.00

30.00

70.06

22.30

X