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The name "navel piercing" is not exactly accurate, however. In reality, the skin directly above the navel is the most popular way to pierce. Of course, a person can pierce the skin on the bottom and sides of the navel as well.
To allow for easy healing, piercers generally use a standard barbell to pierce the navel. Navel piercings have their own special kind of barbells, though. They are sometimes referred to as "bananabells" or "bananabars" because of their curved design."
Body jewelry is measured by "gauges." Belly buttons are customarily pierced with 14 Gauge, or 1/16", barbells. The Association of Professional Piercers (APP) states that no greater than 14 GA body jewelry may be used in piercings below the neck. This is to prevent the risk of a negative reaction or skin tearing.
A standard belly ring is 3/8" long, but people sometimes use a longer barbell at the time of piercing to allow room for the area to swell slightly. The balls on a standard belly button ring are usually two different sizes; the top ball is 5 mm in diameter while the bottom ball is 8 mm in diameter.
Even though it is generally regarded as safe, getting one's navel pierced does involve risk. The most common risks include pain at the piercing site, swelling, scarring and infection. Having the piercing done with sterilized tools in a sterilized environment is the smartest way to minimize risk.
For a belly button piercing to heal, it can take from four months to one year. There are many things that affect the healing process of a navel ring: sweat, shirt fabric, overall health, care and quality of jewelry. Only 316L and 316LVM surgical steel are approved as "implant grade" materials by the American Society of Testing and Materials (ASTM).
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