If anyone can answer for any of these. . . .
. . . Ear lobe
. . . Tragus
. . . Ear cartilage
. . . Any other ear piercing
. . . Nose (nostril)
. . . Eyebrow
. . . Any lip piercing
. . . Septum
. . . Bellybutton/Navel
. . . Tongue
. . . then that would be great. Thanks if you answer 
What are the most common gauges for different piercings?
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Well every piercing can differ. Gun studs can be anywhere from 22-16g. And professional piercings generally 16g+, depends what the piercers feels comfortable with.
This are just VERY rough. You can people who pierce with 12g as standard, and some who refuse to use anything larger than 18g. But for the most part, professional piercers will use 16-12g.
Earlobes 22-12g
Tragus 16-14g
Various cartilidge 16-14g
Nostril 20-16g
Eyebrow 16g
Lips 16-12g
Septum 16-12g (normally 16 for women, though mine was done at 12g)
Navel 14g
Tongue 14g.
Ask, and they’ll see if your anatomy is right, and they’ll gladly do it for you
Lobes about 18 or 20
Lip 14g
nose 16g
Ear lobe: usually 18 gauge, but can be stretched to larger gauges
Tragus: 16 to 18 gauge. Normally 18.
Cartilige: usually 18 gauge as well, unless you get a helix industrial, which is a gauge or so bigger
Ear piercings are usually all 16 and 18 gauges all around
Nose: is also 16 or 18.
Eyebrow: 14 to 16
Lip: 14 gauge
Septum: 14, but can be stretched
belly: 14
tongue: 14
Hope I helped
piercings all generally start at 14 to 18 but most can be stretched or ‘gauged’ after
Good luck!