Proof Buffalos, graded a Near Perfect Proof-69 Deep Cameo by PCGS, are highly sought after for exceptional strikes and deep cameo contrast. American Buffalo Gold Bullion Coins were the first .9999 fine Gold coins struck by the U. S. Mint. Update your set! Black Diamond refers to the American bison widely accepted as the model for James Earle Fraser’s Buffalo Nickel reverse. This design was chosen to adorn the Gold Buffalo coins first released by the U.S. Mint in 2006. Black Diamond was the largest animal of his kind in captivity when Fraser chose him as the subject of his new work. Housed in New York’s Central Park Menagerie, Black Diamond wowed crowds with his majestic mane and sheer size for 20 years. Just like Fraser's design and Black Diamond, the U.S. Mint Gold Buffalo is a true American treasure.