Gold-filled finish is a widely used finishing treatment in the US.
It is a high quality 14K Gold plating applied on a brass base.
The gold weight corresponds to 1/20 of the total weight of the object. This is about 50 to 100 more than in a conventional gold-plated product.
The Gold-filled jewelry has the appearance of entirely gold jewelry for a much lower cost.
A gem in the Gold-filled is restistant and will last longer than a standard gold plated object. (In normal use).