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
Diamond Lookalikes Listed by Specific Gravity
Distinguishing diamond lookalikes from the real thing can be challenging. Learn how to use specific gravity and birefringence to make...
Read More
Table of Gems Ordered by Crystal System
This table contains a selection of minerals gemologists may encounter as jewelry stones or gem specimens. The gems are sorted...
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
Gemology Cheat Sheets
These gemology cheat sheets review gem color and clarity grading, specific information on evaluating diamonds and opals, and basic gem...
Read More
Latest Articles
A Guide to Early Victorian Romantic Period Jewelry
The Romantic Period marked the start of the Victorian Era. Learn about the typical qualities of Romantic Period jewelry, including...
Read More
Malaya or Malaia Garnet Value, Price, and Jewelry Information
Malaia or malaya garnets are typically light to dark, slightly pinkish orange, reddish orange, or yellowish orange in color. This...
Read More
Choosing Your First Gemstones: A Rough Guide for Faceters
How should novice faceters choose their first gemstones? Learn which gem rough materials combine cutting ease, low cost, good size,...
Read More
Gemstone Coatings: CVD and More
Gemstone coatings are a simple way to enhance color and luster. Learn about commonly coated gems, different coating techniques, and...
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!