Ring Size Comparison Chart
Ring Size Comparison Chart compliments of the International Gem Society. A conversion table of Ring sizes. 7 different ring size equivalents available.
By International Gem Society, updated on
| US Standard (Also Canada) | Diameter in Inches | British Equivalent | French Equivalent | German Equivalent | Swiss Equivalent | Japanese Equivalent |
| 0 | .454 | - | - | - | - | - |
| 1/2 | - | A | - | - | - | - |
| 1 | .487 | B | - | - | - | 1 |
| 1 1/2 | .503 | C | - | - | - | - |
| 2 | .520 | D | 41 ½ | 13 ¼ | 1 ½ | 2 |
| 2 1/2 | .536 | E | 42 ¾ | 13 ¾ | 2 ¾ | 3 |
| 3 | .553 | F | 44 | 14 | 4 | 4 |
| 3 3/8 | - | G | 45 ½ | - | 5 ½ | 5 |
| 3 1/2 | .569 | - | - | 14 ½ | - | - |
| 3 3/4 | - | H | 46 ½ | - | 6 ½ | - |
| 4 | .585 | H ½ | - | 15 | - | 7 |
| 4 1/4 | - | I | 47 ¾ | - | 7 ¾ | - |
| 4 7/8 | - | J | 49 | - | 9 | - |
| 5 | .618 | J ½ | - | 15 ¾ | - | 9 |
| 5 1/8 | - | K | 50 | - | 10 | - |
| 5 1/2 | .634 | L | 51 ¾ | 16 | 11 ¾ | - |
| 6 | .650 | M | 52 ¾ | 16 ½ | 12 ¾ | 12 |
| 6 1/2 | .666 | N | 54 | 17 | 14 | 13 |
| 7 | .683 | O | 55 ¼ | 17 ¼ | 15 ¼ | 14 |
| 7 1/4 | .699 | P | 56 ½ | 17 ¾ | 16 ½ | 15 |
| 8 | .716 | Q | 57 ¾ | 18 | 17 ¾ | 16 |
| 8 1/2 | .732 | - | - | 18 ½ | - | 17 |
| 8 5/8 | - | R | 59 | - | 19 | - |
| 9 | .748 | - | - | 19 | - | 18 |
| 9 1/8 | - | S | 60 ¼ | - | 20 ¼ | - |
| 9 1/4 | .764 | - | - | 19 ½ | - | 19 |
| 9 5/8 | - | T | 61 ½ | - | 21 ½ | - |
| 10 | .781 | T ½ | - | 20 | - | 20 |
| 10 1/4 | - | U | 62 ¾ | - | 22 ¾ | 21 |
| 10 1/2 | .797 | U ½ | - | 20 ¼ | - | 22 |
| 10 5/8 | - | V | 63 ¾ | - | 23 ¾ | - |
| 11 | .814 | V ½ | - | 20 ¾ | - | 23 |
| 11 1/8 | - | W | 65 | - | 25 | - |
| 11 1/2 | .830 | - | - | 21 | - | 24 |
| 11 5/8 | - | X | 66 ¼ | - | 26 ¼ | - |
| 12 | .846 | Y | 67 ½ | 21 ¼ | 27 ½ | 25 |
| 12 1/2 | .862 | Z | 68 ¾ | 21 ¾ | 28 ¾ | 26 |
| 13 | .879 | - | - | 22 | - | 27 |
Ring Size Comparison Chart
Compliments of The International Gem Society
Related Articles
Gem Structure Table
How does a gem's crystal system affect its properties? Consult our gem structure table to learn more about selected gemstones....
Read More
METAL/WAX FORMULAS
Jewelers need to know how to determine how much gold is needed for a wax mold. Here are three methods...
Read More
How to Estimate Gem Weight in a Jewelry Setting
Although you can't weigh a gemstone in a jewelry setting, you can get a close approximation of the gem weight...
Read More
Properties of Diamond Simulants
Diamond simulants, like cubic zirconia and moissanite, often appear in jewelry. See how the properties of real diamonds compare with...
Read More
Latest Articles
800 Years of Mogok: A Celebration in Tenuous Times
As Mogok, Myanmar prepares to celebrate its 800th anniversary, the inhabitants of this prolific gem producing region face an uncertain...
Read More
What is the Average Gemstone Faceting Yield?
What’s the average gemstone faceting yield from a single piece of rough? Learn how to estimate how much material you’ll...
Read More
Pyroxmangite Value, Price, and Jewelry Information
Pyroxmangite grains are rare, seldom clean enough to facet, and difficult to cut. However, when cut, they are extremely beautiful...
Read More
How to Identify Emerald Simulants and Synthetics
Gemologists can separate natural emeralds from emerald simulants and synthetics. Learn about the most common tools and techniques for this....
Read More
