Gauge sizes go up (or down, depending on how you look at it) in even numbers from there, so the next largest size from an 18g is 16g, then 14g, then 12g, and so on.
One may also ask, can I put a 16g in a 14g septum piercing?
Yes you can. The jewellery won’t be very snug, though, and might move around a lot. So I used this 2mm diameter needle for a piercing with a 16g jewellery. …
Likewise, is 14g bigger or smaller than 16g? The lower the number, the bigger the needle or jewelry. … So buy 16g jewelry and a 14g needle, or 14g jewelry and a 12g needle.
