metal --> metals Gold is one of many different metals (silver, tin, copper, etc.). "gold" is a noncount noun and "one" is singular, but you are saying that it belongs to a group of metals, which means you have to have -s on the end of metal. He is one of the most popular musicianS in the world.

You should correct the world" metal".It should be"metals".According to the sentence,gold is only one of the most prized metals in the world because there are many other metals that are as highly prized as gold in the world