Wow. Imagine doing all that fine work without any optical aids like a Jeweler’s Loupe. All with the naked eye.
Some researchers presume those fine pieces of weaving and embedded wire were not done by the Danish of the 6tf Century, but more likely by those in either Constantinople
or Persia.
They had easier access to Visby Lenses; high quality, rock crystal lenses, capable of 3x magnification and fire starting as well.