The higher the number, the smaller the gauge. If your piercing is a 18 gauge then the 20 gauge would be slightly smaller.
Likewise, which is smaller 20 gauge or 18 gauge nose ring?
The thickest Gauge is 18 Gauge. This would be your choice if you have recently had your nose pierced or wear that gauge normally. 20 Gauge is thinner than 18G and is the standard most popular size.
Also, is a 22 gauge nose ring smaller than a 20 gauge?
Nose piercings can come in several different sizes, too. Most often, a 20 or 18 gauge is used. The smallest gauge is typically considered something along the lines of a 22 gauge, which is very tiny. Gauges get larger with decreasing number (i.e. a size 00G is massive compared to a 20 gauge).