Most of the rings displayed are brass based, plated with 5 microns gold electro plating or rhodium electroplated.
To gold plate, the item is dipped into a solution that contains gold. The item is then shot with an electric current and the resulting electrochemical reaction deposits a thin layer of gold to the outside of the base metal.
Our rings have 5 layers of plating named 5 microns gold electro plated for a longer longevity. There are others in the collection with the definition “gold filled” - “silver base” or rolled gold” explained under our costume jewellery page.