|Enjoy our gold filled chain and rose gold chain, two high quality types of chain by the foot that are made by completely different processes! Gold-filled jewelry components, including our gold filled chain, are composed of a solid layer of gold that is bonded, using a heat process, to a base metal such as brass. The best quality gold-filled pieces will have a similar appearance to 14 karat (58%) gold. Rose gold is a gold and copper alloy, commonly 75% gold and 25% copper by mass. It was popular in Russia in the early 19th century. Increasing the copper content increases the red coloration.