As of Sept. 18, 2014, the price per ounce for silver is $18.65, making the 0.999 silver coin worth the same amount. However, the coin's worth depends on the current market value of silver, which fluctuates rapidly and is updated by the minute. The coin value is also dependent upon the condition, rarity and face value, which is the monetary value stamped onto the coin, such as one dollar.
If there is no face value stamped on the coin, then it is considered a round or medallion rather than a coin. Most 0.999 fine silver coins are actually rounds.
An ounce in terms of silver trading refers to a troy ounce, which is 31.1 grams or 1.10 of a regular ounce. The term 0.999 silver means that the item is 99.9 percent pure silver. The value of the actual silver contained in a coin is known as its melt value. Silver is no longer used to make coins in the United States, and the melt value of old silver coins is often much higher than the face value of the coin.
However, a silver coin that has a lower silver content may actually be more valuable because of its collector value, which depends on the date it was minted, its mint mark and whether it was circulated.