Though there is no universal consensus, the table below has been arranged in order of desirability & value (in our opinion).
|Materials||Base Metal||min. Karatage||min. gold Thickness||min. gold weight1||process||Example of Marking|
|Gold||(Gold is the most desirable but it will also depend on the karatage of gold you are considering. Check gold karatages.)|
|Vermeil||Sterling Silver||14k||2.5 microns||(not specified)||electrolysis
|Gold-filled||usually copper or brass||10k||(not specified)||5% or 1/20th||heat & pressure||"1/20th 12k GF"|
|Rolled-gold||usually copper or brass||10k||(not specified)||(not specified)||heat & pressure||"1/40 12k RGP"|
|Gold-plated||steel, brass, copper, iron, metal alloy||(not specified)||(not specified)||(not specified)||electrolysis
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