What Does GP Mean on Jewelry?

The GP stamp indicates that a piece of jewelry is gold plated — a thin layer of real gold has been deposited onto a base metal core through an electrochemical process called electroplating. The gold layer on GP jewelry is typically very thin, ranging from 0.5 to 2.5 microns (millionths of a meter). To put this in perspective, a single sheet of paper is about 100 microns thick, so the gold coating on plated jewelry is far thinner than a human hair.

Gold-plated jewelry provides the look of gold at a fraction of the cost, making it popular for fashion and costume jewelry. The base metal underneath is usually brass, copper, or a zinc alloy, which provides the structural strength while the gold layer provides the color and appearance. There is no minimum gold thickness required for an item to be called 'gold plated' — some pieces have an extremely thin flash coating that wears off quickly, while higher-quality plated pieces may have a thicker, more durable layer.

The key limitation of gold-plated jewelry is longevity. The thin gold layer will eventually wear through with regular use, exposing the base metal beneath. This process is accelerated by contact with water, sweat, perfume, and lotions. Areas that experience friction — such as ring shanks, bracelet links, and chain connections — will show wear first. Once the plating wears through, the piece cannot be easily restored to its original appearance, though professional replating is possible at some jewelers.

The GP stamp is typically found in the same locations as solid gold marks — inside ring bands, on clasps, and on tags. Other common variations include 'G.P.', 'HGP' (heavy gold plated, indicating a thicker layer), 'RGP' (rolled gold plate), and 'GEP' (gold electroplated). You may also see '14KGP' or '18KGP', which indicates the karat of the gold used for the plating layer, not that the piece is solid 14K or 18K gold.