Not. They are dangerous. They can easily get infected.
Don't base your decision on one random answer. Properly provided
and cared for navel piercings are just fine. Once healed you have
hundreds of navel gem and navel jewellery variations to choose
from. Be smart, buy only from well respected vendors. Have your
piercing done by a licensed professional body piercer and follow
the aftercare instructions, should you have and issue see your
piercer for assistance. Navels are hot!