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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Related categoryes:
  • Jewelry Sizes
  • Jewelry Designs


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