The value of a Saint-Gaudens $20 Coin can vary significantly based on the coin's mint year and overall condition. For example, a Saint-Gaudens in good. The coin prices and values for Gold $20 Double Eagle. Also showing coins for sale in our database for the Coronet Head type Gold $20 Double Eagle. The Double Eagle has a gold content of troy ounces or grams. In , gold was valued at $ per ounce, hence making.