Here is your chance to own a genuine legal tender 1964 Brilliant Uncirculated Silver Kennedy Half Dollar U.S. Coin. The coin is coated fully in genuine 24KT Gold with Black Ruthenium Highlights. Black Ruthenium is a type of platinum metal that looks like a dark platinum, but is 100 times Rarer. Ruthenium is a chemical element with the symbol RU & Atomic # 44. It is a rare transition metal belonging to the platinum group of the periodic table.