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Ring size guide

Don't know your ring size? Planning to buy an engagement ring as a surprise? PROUD DIAMOND saves the day – all the details are provided below.

Virginie Roy

Founder @ Proud Diamond & Maison Proud | Ethical Diamond & Custom Fine Jewelry

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Mastering the art of sizing : 4 ways to determine your ideal ring size.

Embrace modern technology with a ring sizing application on your cell phone.
Request a free ring sizer from one of our team members and get it by mail.
Measure your ring size yourself with a string and a ruler, then refer to the size chart by clicking on the link below.
If it's for a surprise, contact us.

Ring Size Chart Guide

US/CA	Diameter (mm)	Circumference (mm)	UK/AUS	Japan
3	14.0	44.2	F	4
3.5	14.4	45.5	G	6
4	14.9	46.8	H	7
4.5	15.3	48.0	I	8
5	15.7	49.3	J 1/2	9
5.5	16.1	50.6	L	10
6	16.5	51.9	M	11
6.5	16.9	53.1	N	13
7	17.3	54.4	O	14
7.5	17.7	55.7	P	15
8	18.2	57.0	Q	16
8.5	18.6	58.3	R	17
9	19.0	59.5	S	18
9.5	19.4	60.8	T	19
10	19.8	62.1	U	20
10.5	20.2	63.4	V	22
11	20.6	64.6	W	23
11.5	21.0	65.9	X	24
12	21.5	67.2	Y	25
12.5	21.9	68.5	Z 1/2	26
13	22.3	69.7	Z +1	27
13.5	22.7	71.0	—	—

How to determine the size of your bracelet

To determine the size of the bracelet you need, use a string, a pencil, and a ruler. Wrap the string around your wrist so that it goes all the way around, then use the pencil to mark where the two ends of the string meet. Then, take the string and measure its length using your ruler, in inches. Here is a size chart.

Size of your wrist	Size you should take
5 inches and a half	6 inches
6 inches	6 inches and a half
6 inches and a half	7 inches

Carat

Carat is a measurement of weight for diamonds and other precious stones. To give you an idea of the size of a carat, it is also possible to measure it in millimeters, as shown in the table below. Larger diamonds are much more difficult to create in a laboratory and, therefore, are more expensive.

To give you an idea, here are the measurements in millimeters for different diamond shapes :

Carats	Round	Oval	Radiant/Emerald	Princess	Pear
0.25 ct.	4 mm	5 x 3 mm	4.3 x 3 mm	3.25 mm	5 x 3 mm
0.50 ct.	5 mm	6 x 4 mm	6 x 4 mm	4.5 mm	6 x 4 mm
0.75 ct.	5.75 mm	7 x 5 mm	6.5 x 4.5 mm	5 mm	7 x 5 mm
1.00 ct	6.5 mm	7.7 x 5.7 mm	7 x 5 mm	5.5 mm	7.7 x 5.7 mm
1.25 ct.	6.8 mm	8 x 6 mm	7.3 x 5.5 mm	6 mm	8 x 6 mm
1.50 ct.	7.3 mm	8.5 x 6.5 mm	7.5 x 5.8 mm	6.5 mm	8.5 x 6.5 mm
1.75 ct.	7.75 mm	9 x 6.5 mm	8 x 6 mm	6.75 mm	9 x 6.5 mm
2.00 ct.	8 mm	9 x 7 mm	8.2 x 6.2 mm	7 mm	9 x 7 mm

Ring size guide

Virginie Roy

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Mastering the art of sizing : 4 ways to determine your ideal ring size.

Ring Size Chart Guide

Karat

How to determine the size of your bracelet

Carat