| Inside Diameter MM | Inside Diameter Inches | USA/ Canada/ Mexico Ring Size | UK/ Ireland/ Australia/ New Zealand/ South Africa Ring Size | Germany/ France Ring Size | Spain/ Italy Ring Size | Japan/ China/ India/ South America Ring Size |
|---|---|---|---|---|---|---|
| 15 mm | 0.59" | 4 | H | 46.8 | 6,5 | 7 |
| 15.3 mm | 0.60" | 4.5 | I | 48 | 8 | 8 |
| 15.6 mm | 0.62" | 5 | J | 49.3 | 9,5 | 9 |
| 16.2 mm | 0.63" | 5.5 | K | 50.6 | 10,5 | 10 |
| 16.6 mm | 0.65" | 6 | L | 51.9 | 12 | 11 |
| 16.9 mm | 0.67" | 6.5 | M | 53.1 | 13,5 | 13 |
| 17.2 mm | 0.68" | 7 | N | 54.4 | 14,5 | 14 |
| 17.8 mm | 0.70" | 7.5 | O | 55.7 | 16 | 15 |
| 18.1 mm | 0.71" | 8 | P | 57 | 17 | 16 |
| 18.5 mm | 0.73" | 8.5 | Q | 58.3 | 18,5 | 17 |
| 19.1 mm | 0.75" | 9 | R | 59.5 | 20 | 18 |
| 19.4 mm | 0.76" | 9.5 | S | 60.8 | 21 | 19 |
| 19.7 mm | 0.78" | 10 | T | 62.1 | 22,5 | 20 |
| 20.4 mm | 0.79" | 10.5 | U | 63.4 | 23,5 | 22 |
| 20.7 mm | 0.81" | 11 | V | 64.6 | 25 | 23 |
| 21.0 mm | 0.83" | 11.5 | W | 65.9 | 26 | 24 |
| 21.6 mm | 0.84" | 12 | X | 67.2 | 27,5 | 25 |
| 22.0 mm | 0.86" | 12.5 | Y | 68.5 | 29 | 26 |
| 22.3 mm | 0.87" | 13 | Z | 69.7 | 30 | 27 |
| 22.9 mm | 0.89" | 13.5 | Z+2 | 71 | 32 | - |
| 23.2 mm | 0.91" | 14 | Z+3 | 72.3 | 33 | - |
| 23.6 mm | 0.92" | 14.5 | Z+4 | 73.6 | 34,5 | - |
| 24.0 mm | 0.94" | 15 | Z+5 | 74.8 | 35 | - |
![Oval Signet Ring [Old English]](http://www.luvaj.com/cdn/shop/files/Signet-Ring-Oval_SG_Gv2RobertoGaxiola_17644a63-3b58-4bf4-8c22-433a45a74e52.jpg?v=1694104778&width=200)
![Oval Signet Ring [Vintage]](http://www.luvaj.com/cdn/shop/files/Signet-Ring-Oval_GA.jpg?v=1694462642&width=200)
![Hexagon Signet Ring [Old English]](http://www.luvaj.com/cdn/shop/files/Signet-Ring-Hexagon_GA_1e279b20-cae9-4f5d-917d-b4c1388db87a.jpg?v=1694104685&width=200)
![Hexagon Signet Ring [Vintage]](http://www.luvaj.com/cdn/shop/files/Signet-Ring-Hexagon_SC_Gv2RobertoGaxiola.jpg?v=1694471082&width=200)
