To find the market value of platinum per gram, divide the current spot price (quoted per troy ounce) by 31.1 (grams in a troy ounce). You can view the current spot price and learn more about troy measurements at the links below.
It is 1 troy oz of 999 fine silver. So its value is the current silver price for 1 troy oz. Depending on its condition there could be some additional numismatic value to collectors too. Current silver price as of this moment is $34.28 per troy oz of fine silver.
The current spot price of silver is about $14/oz
gold is measured in troy ounces. there are 31.1 grams per troy ounce. At $1000/oz x 1 oz/31.1 grams = $32.15
The value fluctuates on a daily, if not hourly, basis. You must do a web search on "precious metals values" for a current quote.
About 1405$USD per troy oz. There is no "local".
6-28-11>> Platinum is at $1,674.00 per ounce, but the purity for all US platinum coins is marked as .9995 not .999
The value of 12.8 grams of pure silver would depend on the current market price of silver. You could multiply the weight of the silver (12.8 grams) by the current price per gram to determine the total value.
1 troy oz = 1.09714286 "regular" ounces.
The value of a National Refiners Assayers 1 troy ounce silver bar is based on the current market price of silver. You can check the current market price of silver online or contact a reputable dealer for an accurate valuation.
At current spot price ($29.24) value is $214.33. The Washington Mint silver piedforts were marked and marketed in avoirdupois weight. Half pound(8 oz.) avdp = 7.33 oz. troy. Since market price of pure silver has basis in troy weight system, the conversion is necessary to calculate correct value.
The value of a troy ounce with Roger Maris on it would depend on the current market demand for collector coins or precious metals featuring his image. Typically, the numismatic value of such a coin would be higher than the intrinsic value of the metal it contains. It is recommended to consult with coin dealers or collectors for a more accurate valuation.