Ring Size Chart

TFR
(US)
Size

UK FR JP

Finger Size
/
Ring 

(mm)

3 F 44

4

43.8 ~ 45.3
/
14.1
3.5 G 1/4 45 1/4 5~6 45.3 ~ 46.4
/
14.5
4 H 1/2 46 1/2 7

46.4 ~ 47.6
/
14.9

4.5 I 1/2 49 8 47.6 ~ 49.1
/
15.3
5 J 1/2 50 9~10 49.1 ~ 50.4
/
15.7
5.5 L 51 3/4 11

50.4 ~ 51.7
/
16.1

6 M 52 3/4 12 51.7 ~ 52.8
/
16.5
6.5 N 54 13 52.8 ~ 54.2
/
16.9
7 O 55 1/4 14 54.2 ~ 55.3
/
17.4
7.5 P 56 1/2 15 55.3 ~ 56.8
/
17.8
8 Q 57 3/4 16 56.8 ~ 59.2
/
18.2
8.5 Q 3/4 59 17 57.9 ~ 59.2
/
18.5
9
R 3/4 60 1/4 18 59.2 ~ 60.8
/
18.9
9.5 S 3/4 61 1/2 19 60.8 ~ 62.0
/
19.4
10 T 1/2 62 3/4 20~21 62.0 ~ 63.2
/
19.8
10.5 U 1/2 63 22 63.2 ~ 64.6
/
20.2
11 V 1/2 65 23 64.6 ~ 66.0
/
20.7

 

Measure Finger Size (mm)

  1. Wrap a strip of paper or ribbon snugly around your finger, then use a pen to mark where the strip overlaps.

  2. Measure the marked strip with a ruler - ensure it’s exact and don’t round up! The ribbon or paper strip should be comfortable enough to slip on and off your finger easily.

 

Measure Ring ⌀ (mm)

  1. Using an existing ring that fits you well, place a ruler in front of the ring to measure the inside diameter.

  2. Match it to the closest size in the chart below. If you are between sizes, we recommend choosing the larger size.

What diamond size works best on my finger?

It isn't always the bigger the better when it comes to the size of a diamond. A few other factors may also contribute to how a piece of diamond is perceived on the wearer.

Finger Proportions and Shape:

Slender fingers benefit from elongated diamond shapes like ovals, marquise, or pear, creating the illusion of length. Wider fingers, on the other hand, can be complemented by round, princess, or cushion-cut diamonds, offering a balanced and symmetrical look.

Diamond Shape:

Different diamond shapes of the same carat weight impact perceived size. Round brilliant cut appears larger due to optimal light reflection. Elongated shapes like ovals and marquise create the illusion of greater size, while emerald and princess cuts may appear slightly smaller.

Diamond Setting:

The choice of setting influences perceived size. High-profile settings like halo settings create the illusion of a larger diamond, while lower-profile settings like bezel settings may make the center stone appear slightly smaller.

Ring Size Chart

Measure Ring ⌀ (mm)

  1. Using an existing ring that fits you well, place a ruler in front of the ring to measure the inside diameter.
  2. Match it to the closest size in the chart below. If you are between sizes, we recommend choosing the larger size.

Measure Finger Size (mm)

  1. Wrap a strip of paper or ribbon snugly around your finger, then use a pen to mark where the strip overlaps.
  2. Measure the marked strip with a ruler - ensure it’s exact and don’t round up! The ribbon or paper strip should be comfortable enough to slip on and off your finger easily.

TFR
(US)
Size

UK FR JP

Finger Size
/
Ring 

(mm)

3 F 44

4

43.8 ~ 45.3
/
14.1
3.5 G 1/4 45 1/4 5~6 45.3 ~ 46.4
/
14.5
4 H 1/2 46 1/2 7

46.4 ~ 47.6
/
14.9

4.5 I 1/2 49 8 47.6 ~ 49.1
/
15.3
5 J 1/2 50 9~10 49.1 ~ 50.4
/
15.7
5.5 L 51 3/4 11

50.4 ~ 51.7
/
16.1

6 M 52 3/4 12 51.7 ~ 52.8
/
16.5
6.5 N 54 13 52.8 ~ 54.2
/
16.9
7 O 55 1/4 14 54.2 ~ 55.3
/
17.4
7.5 P 56 1/2 15 55.3 ~ 56.8
/
17.8
8 Q 57 3/4 16 56.8 ~ 59.2
/
18.2
8.5 Q 3/4 59 17 57.9 ~ 59.2
/
18.5
9
R 3/4 60 1/4 18 59.2 ~ 60.8
/
18.9
9.5 S 3/4 61 1/2 19 60.8 ~ 62.0
/
19.4
10 T 1/2 62 3/4 20~21 62.0 ~ 63.2
/
19.8
10.5 U 1/2 63 22 63.2 ~ 64.6
/
20.2
11 V 1/2 65 23 64.6 ~ 66.0
/
20.7

Diamond size on finger

Choosing the right diamond carat size is crucial when it comes to finding the perfect fit for your diamond rings or other jewelry. While personal preference plays a significant role, understanding how diamond carat sizes complement different finger sizes and shapes can help you make an informed decision.

0.25 - 3.00 carats

0.25 - 3.00 carats

Emerald cut

0.25 - 3.00 carats

0.25 - 3.00 carats

Brilliant cut

0.25 - 3.00 carats

0.25 - 3.00 carats

Oval cut

0.25 - 3.00 carats

0.25 - 3.00 carats

Princess cut

Diamond carat weights - as offered by The Future Rocks

A diamond carat is a unit of weight used to measure diamonds. One carat equals to 200 milligrams or 0.2 grams. Here's a general table that shows the approximate relationship between carat weight and diamond diameter.

Please note that these diamond measurements are approximate and can vary based on the specific cut, shape, and proportions of the diamond.

Carat Weight (ct) Diamond Diameter (mm)
0.25 4.1
0.50 5.2
1.00 6.5
1.50 7.4
2.00 8.2
2.50 8.9
3.00 9.4

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