Live Gold Price = 1,484.30
https://www.kitco.com/charts/livegold.html
"(7) A fifty dollar gold coin that is 32.7 millimeters in diameter, weighs 33.931 grams, and contains one troy ounce of fine gold.
(8) A twenty-five dollar gold coin that is 27.0 millimeters in diameter, weighs 16.966 grams, and contains one-half troy ounce of fine gold.
(9) A ten dollar gold coin that is 22.0 millimeters in diameter, weighs 8.483 grams, and contains one-fourth troy ounce of fine gold.
(10) A five dollar gold coin that is 16.5 millimeters in diameter, weighs 3.393 grams, and contains one-tenth troy ounce of fine gold."
https://www.law.cornell.edu/uscode/text/31/5112
$50 U.S. gold coin = 1 troy oz. = 1,484.30 FRN
$25 U.S. gold coin = 1/2 troy oz. = 742.15 FRN
$10 U.S. gold coin = 1/4 troy oz. = 371.075 FRN
$5 U.S. gold coin = 1/10 troy oz = ??? FRN