Gold Nuggets & Gold Flakes for Metal Detector Testing : Looking to test your metal detector for gold? The first place most people start is with their own wedding band or some small ear rings. Another way to test is by purchasing gold nuggets and flakes. (gold leaf) By having some gold, it can teach you to set up your detector for what you are looking for. Various sizes of gold can give you a clue where the discrimination on your detector should be set, according to the type of hunting you are doing. By using gold flakes, you can dial in that sensitivity right where you need it. Gold Leaf.