Gold jewelry should have a stamp or “hallmark” showing its metal mixture. Depending on the area of the world, this may legally need to be marked on the gold itself, or (in the US), somewhere close by, like the item’s package. The gold may be stamped with a 14K or 14Kt symbol, indicating “14 karat”, or a “583 or 585”, indicating 583/585 grams of gold per thousand.