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
International Gem Society
Related Articles
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
Table of Refractive Indices and Double Refraction of Selected Gems
Refractive indices and double refraction (birefringence) help gemologists identify gems. The following table lists these values for selected gemstones.
Read More
Birthstone Chart
What are the birthstones by month? January is garnet, February is amethyst, March is aquamarine, April is diamond, May is...
Read More
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
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
Never Stop Learning
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get Gemology Insights
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!