Aurumline® is jewelry that is bright, silvery in color even though it contains no silver at all. These pieces of jewelry are not "colored" in the classic sense, they are 316L Steel or Titanium covered with a thin plasma film of 24k gold (PVD coating). The thin film is very strong and does not fade. The technology has been used since the end of the 80s and is used, among other things, for implants to provide an extra hard-wearing surface.