Gold fill should not be mistaken with solid gold, however, it has the same desirable properties and look of solid gold. It is a multiple layers of gold bonded to a base metal, such as brass.
It won’t tarnish and will not rub off or turn colours. Wearers who are sensitive to certain metals can wear gold filled without worries of an allergic reaction. Gold filled accessories can be worn even daily without fear of fading or rubbing off for many cases as long as 30 years.