The most common gauge for septum piercings is 16 gauge (approx. 1.2mm thick), however, your piercer may decide to use a different gauge depending on your individual anatomy. While 16G is the typical starter gauge, some people choose to size down to 18 gauge (approx. 1.0mm thick) or size up to 14 gauge (approx.
In this way, can I put a 14g in a 16g septum piercing?
Most septums are pierced at a 14g or a 16g more commonly. Say you got pierced at a 16g, once it’s healed. Putting a 14g ring in wouldn’t be hard at all, same as putting a 12g ring in. Once it gets to around there it’s better to start using tapered jewelry.