Are you talking about gold and silver coins or ordinary commemorative coins I know how to distinguish a set of 29 ordinary commemorative coins. First look at the front of each coin, that is, the front of the queen's head. The queen's hair is layered, it feels concave and convex, and the curly part of her hair has a three-dimensional effect. The fake one doesn't look three-dimensional It feels like a knife, and compared with the real thing, the curly part of her hair is not clear. The second place is the opposite. Each coin has the emblem of the London Olympic Games, and there is a small symbol of five rings on the emblem. Although the five rings are small, the real money looks very clear. The fake ones look like five dots, some coins have not been printed yet, and some are blurred. I mainly look at the authenticity of these two kinds of coins, most of which are the same. I use the comparison between true and false myself, and I can continue if necessary.