Wealth mainly refers to having money or property.
Treasure refers to the possession of gold, silver and jewels, as well as valuable things, cherished things and so on. Nicolas Cage, an American movie star, once starred in a movie called National Treasure, which was called National Treasure in Chinese. In the film, Nicolas Cage and his friends stole the national constitution from the stone steps in front of the National Archives. The national constitution of the United States kept in the National Archives is of great value.
Wealth refers to having a lot of money, as well as opportunities and destiny.