Coin silver was once a common alloy in the United States. It is now relatively rare and the name causes some confusion. The technical “coin silver” alloy is .900 prata, ou 90% prata e 10% cobre. It was not used to make coins, but at one point in time it was made from refined scrap coins. Moedas monetárias em nosso país, e a maioria dos outros, no longer contain silver and are made from more inexpensive and durable base metals. As joias de prata que ainda estão no mercado terão um selo de qualidade de .900, and they are rare antiques.