20G
Besides, is 16 or 18 gauge earring thicker?
Gauge Sizing
Though it seemingly goes against logic, earrings and other jewelry gauge sizes actually get bigger the lower the number of the gauge. An 18 gauge, one of the smallest gauges, is actually smaller than a 16 gauge earring, with the largest gauges being 0, 00, and 000 gauge jewelry.
In respect to this, can you put a 16g in a 14g piercing? Yes all day you can. However, the 16g post is thinner than the 14g. Downsizing is not an issue unless you‘ve got a large collection of 14g jewelry that you wish to wear again. Downsizing to 16g is safe as long as it is healed.
