Where is the hallmark on a gold chain?
On chains the hallmark is almost always at the clasp: on the bar of the lobster clasp, on the spring ring or on a small tag right next to the clasp. On fine chains it is tiny; a magnifying glass or your phone's zoom helps you read it. Common stamps are 333, 585 and 750, and on chains from abroad also 375 (9 carat) or marks such as 14K and 18K.
If the number comes with an addition such as GF, GP, RGP or a fraction like 1/20, the chain is not solid but only covered with gold. How to recognise such layers, and which home tests are of any use, is explained in our guide How to tell real gold.
If the clasp sticks to a magnet, that is not yet a bad sign: the spring inside the spring ring is often made of steel. We deduct parts made of other metals, such as steel springs, from the weight and show you the deduction. If the hallmark is missing or worn away, we test the fineness free of charge.
