x512x:
An ounce of gold is 31.10 grams and is worth, say, $1,400. Your coin is 91% gold and weighs 1.997 grams - so let's say it has 1.80 grams of gold.
On the spot market gold is $45 per gram ($1,400/31.10) and you paid $45 for 1.8 grams of gold.
Good luck to all,
~The Old Bookaroo