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When considering belly button jewelry sizes, there are two basic types, each with varying sizes. The jewelry you'll receive for a first piercing will probably be a barbell -- a tiny stick made of a non-allergenic metal or plastic with two balls screwed onto either end to keep the stick in place. These barbells are sized by thickness and length. If you're not getting a barbell, you'll most likely get a circular ring. The size of rings is determined by diameter and thickness.
Typical lengths include:
Bonus Tip: If you're looking to eventually stretch your piercing, you can begin with the lowest gauge your piercer thinks is best for you. In the long run, it will be easier to gradually increase the size of your piercing.