1000 grams
A modern American Silver Eagle $1 Coin contains 1 ounce of silver. Be careful though. Many people mistakenly think that old silver dollars are also "eagle" dollars, but they aren't/ Those coins were...
The coin is one Troy ounce of silver, the purity is 99.93% silver with .0007% copper
sterling silver is 92.5% silver, any more and the metal would be too soft and break easily. also be sure to ask what it is combined with.
Sterling silver is 92.5% silver. The rest is other metals, usually copper.