The $25 Half-Ounce American Gold Eagle was designed by Augustus Saint-Gaudens (obverse) and Miley Busiek (reverse). Weighing 16.966grams and composed of .9167 gold .03 Silver, .0533 copper (netting 1/2oz gold). These coins are 27mm in diameter, have reeded edges and are produced in both an Uncirculated and Proof version.