If you go to KitCoyou will get the daily chart for 925 sterling silver. Remember that these charts are done by Ounces not per gram. You can convert the price from there if you know that An ounce is equal to 28.3495231 grams. When converting an ounce into a gram round grams into 28.35 which is to understand that one ounce is equal to 28.35 grams. An ounce is abbreviated oz. and a gram is abbreviated g. Ounces and grams is used to measure weight. An ounce is a measurement of weight that can be measured as fluid ounces (liquid weight). The average can of Coco-Cola or Pepsi Cola is 12 fluid ounces which is 340.19 grams. In the metric system liquid is usually measured by liter and the gram is used for measuring weight. You can do a Yahoo search for charts to let you know the daily value of 925 Sterling silver in either Grams or Ounces. I am in the jewelry industry and find that Kitco is very accurate with their rates as you can either use the NYC Stock Exchange Data or The London Data.
Most charts are referring to .999 fine silver, in other words, investment bars etc. However the chart I have linked you to is for 925 sterling silver and it changes hourly or more often during the week while trading is going on.
At the end of the day it will take you 28.35g to have 1oz of 925 sterling silver, and to be honest most jewelers won't buy just one or two ounces of sterling silver.
I wish you the best of luck and hope you found this helpful.