Cheap Tiffany & Co. uses standard FR ring sizes. These suggested UK sizes are simply a reference. Please note that rings of the same size may have a slightly different fit depending on their design.
RING SIZE CONVERSION |
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| US | UK | FR | HK | Inner Circumference (mm) | Inner Diameter (mm) |
| 4 | H ½ | 47 | 7 | 47 | 14.97 |
| 4.5 | I ½ | 48 | 8 | 48 | 15.29 |
| 4.77 | 49 | 9 | 49 | 15.61 | |
| 5.25 | 50 | 10 | 50 | 15.92 | |
| 5.6 | 51 | 11 | 51 | 16.24 | |
| 6 | L ½ | 52 | 12 | 52 | 16.56 |
| 6.35 | 53 | 13 | 53 | 16.88 | |
| 6.75 | 54 | 14 | 54 | 17.2 | |
| 7.2 | O ½ | 55 | 15 | 55 | 17.52 |
| 7.5 | P | 56 | 16 | 56 | 17.83 |
| 7.9 | 57 | 17 | 57 | 18.15 | |
| 8.25 | 58 | 18 | 58 | 18.47 | |
| 8.7 | 59 | 19 | 59 | 18.79 | |
| 9.05 | S | 60 | 20 | 60 | 19.11 |
| 9.5 | T | 61 | 21 | 61 | 19.43 |
| 9.85 | 62 | 22 | 62 | 19.75 | |
| 10.25 | U ½ | 63 | 23 | 63 | 20.06 |
| 10.3 | 64 | 24 | 64 | 20.38 | |
| 11 | W | 65 | 25 | 65 | 20.7 |