The United States Mint 1984 Olympic Commemorative Proof Silver & Gold Coin Set includes a collection of coins minted by the U.S. Mint to commemorate the 1984 Olympic Games. The set features 2 silver and 1 gold coin, with the gold coin being made of 0.90 / 21.6 karat pure gold. These coins carry a Certificate of Authenticity (COA) to verify their authenticity and origin, making them a valuable and collectible item for coin enthusiasts and investors alike.