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What means 18kgp on a chain?

18KGP stands for 18 Karat Gold Plated. This means that the chain is made of a base metal, usually copper, that has been coated with a thin layer of gold. The thickness of the gold plating is measured in microns, with 18KGP indicating a plating thickness of 18 microns. This is considered to be a relatively thick plating, and will typically provide good durability and wear resistance.