Jewelry sizes
Jewelry is measured by gauge (thickness) and inside diameter in the case of rings or length from ball to ball in the case of barbell studs. The higher the gauge number, the thinner the jewelry.
Most jewelry manufactured in the US is gauged according to the Brown & Sharpe system. Jewelry from the UK and Europe are manufactured by metric gauge.
Gauges and Equivalents
Brown and Sharpe Gauges (used by most American manufacturers)
| Gauge |
Inches |
Millimeters |
| 20 |
0.032 |
0.812 |
| 18 |
0.040 |
1.024 |
| 16 |
0.051 |
1.291 |
| 14 |
0.064 |
1.628 |
| 12 |
0.081 |
2.053 |
| 10 |
0.102 |
2.588 |
| 8 |
0.128 |
3.264 |
| 6 |
0.162 |
4.115 |
| 4 |
0.204 |
5.189 |
| 2 |
0.258 |
6.544 |
| 0 |
0.325 |
8.251 |
| 00 |
0.365 |
9.266 |
| 000 |
0.410 |
10.405 |
| 0000 |
0.460 |
11.684 |
Silver Anchor Gauges
| Gauge |
Inches |
Millimeters |
| 20 |
1/32 = 0.03125 |
|
| 16 |
3/64 = 0.046875 |
1.19 |
| 14 |
1/16 = 0.0625 |
1.59 |
| 12 |
3/32 = 0.09375 |
2.38 |
| 8 |
1/8 = 0.125 |
3.18 |
| 6 |
5/32 = 0.15625 |
3.97 |
| 4 |
3/16 = 0.1875 |
4.76 |
| 2 |
1/4 = 0.25 |
6.35 |
| 0 |
5/16 = 0.3125 |
7.94 |
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