All Proud Diamond rings are offered in standard US/Canada sizes. Use this ring size chart as a reference to compare inner diameter, circumference in millimeters, and international equivalents.
The right ring size should feel comfortable all day while staying securely in place. If you are between two sizes, we often recommend choosing the half size up, especially for a wider band or if your fingers tend to swell.
Wrap a thin strip of paper or string around the base of the finger, mark where it meets, then measure the length in millimeters. Compare that measurement with the size chart.
Choose a ring that already fits the correct finger, measure its inner diameter, then find the US/Canada equivalent in the chart.
For the most accurate measurement, get a ring sizer before choosing an engagement ring, wedding band, or solid gold ring.
How do I measure my ring size at home?
Use a thin strip of paper or string, mark where it meets around your finger, then measure the length in millimeters. Repeat the measurement two or three times to confirm.
What is the average ring size?
The average ring size for women is often between 6 and 7 in US/Canada sizing. For men, it is often between 9 and 10. This is only a general reference: measuring the finger is always the best option.
What should I do if I am between two sizes?
We often recommend choosing the half size up. A ring should pass over the knuckle without being too tight, then stay stable once worn.
Choosing a surprise ring?
Borrow a ring worn on the correct finger, measure its inner diameter, or contact our team for help choosing a safe starting size.
You can also explore our lab diamond rings or our engagement rings with more confidence.
| 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 | — | — |
Use this quick guide as a starting point when choosing a ring size on a product page. Proud Diamond rings use standard US/Canada sizing.
For the complete chart, measuring tips, and ring sizer request, visit our full ring size guide.
Karat measures gold purity, 1 karat = 1/24 gold purity. With 24 karats being pure but soft, less ideal for jewelry. Gold is alloyed for durability, like 18 karat (75% gold) for intricate pieces, and 14 karat (58.3% gold) for a balance of strength and affordability. This applies to yellow gold, white gold, and rose gold. For your information, our 18-karat yellow gold has a richer hue compared to 14-karat yellow gold. The tone of our yellow gold is soft and subtle, avoiding an overly yellow appearance. As for 18-karat rose gold, the color is also deeper than that of 14-karat rose gold.
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 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 |