Keep in mind that navel jewelry with many/long dangling parts can be fragile, it is easy for clothes to get caught and pulled in the pendant, and you should not sleep with navel bars with long pendants.
Zirconline® is colored jewelry, they are not "colored" in the classic sense, it is 316L Steel or Titanium that is covered with a thin plasma film (PVD coating). The thin film is very strong and does not fade. The technology has been used in the medical industry since the late 80's and is used, among other things, for pacemakers and orthopedic implants to provide an extra durable surface.