noun, noun or participle which takes 'suru'
Refers to the act of piercing the ear or the resulting hole/jewelry. Often used with する to mean 'to get one's ears pierced'.
先週、初めてイアピアスをした。
I got my ears pierced for the first time last week.
彼女は小さなダイヤのイアピアスをしている。
She is wearing small diamond ear piercings.