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
The Mohs Hardness Scale and Chart for Select Gems
The Mohs hardness scale measures a mineral's resistance to scratching. Find the traditional scale here and a chart of select...
Read More
Specific Gravity Values of Selected Gems
Measuring specific gravity helps gemologists identify gemstones. The following table lists the specific gravity values for a variety of gem...
Read More
Standard Gem Sizes Chart
Will your gem fit in a standard setting? Use this chart of standard gem sizes for popular cuts and also...
Read More
Weights and Measures Conversion Chart
Printable chart to convert weights and measures including Carats, Grams, Kilograms, Ounces, Pounds and Troy Ounces Pounds and Pennyweights.
Read More
Latest Articles
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
Red Gemstones: Ruby, Spinel, Garnet, and Other Great Picks for Jewelry
Red gemstones are popular choices for engagement rings and fine jewelry. The three most popular stones are ruby, garnet, and...
Read More
Jadeite Value, Price, and Jewelry Information
Explore jadeite gemstone value, learn the facts about jadeite vs jade, and discover how to identify quality jadeite jewelry.
Read More
Tips for Cutting and Polishing Halite
Halite is a very difficult material to facet, even for experts. Jeff Graham offers his advice on how to cut...
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!