[masraum]

I did a search for "value of gold" the first hit that I got was a chart that's updated every 2 minutes.

http://www.kitco.com/charts/livegold.html

right now it's almost $760 an ounce.

I then did a search for "test gold" and came up with this on the first hit

For these pieces, the gold test is the answer. "You've heard the expression, 'Give it the acid test,'" Barry says. "Well this is literally giving gold the acid test." The process begins by rubbing some of the metal from the jewelry against a slate (or sometimes a special piece of glass). "It scrapes off the gold like chalk on a board," Barry says, yet so little gold rubs off that it doesn't damage the jewelry.

Then, acid is poured on the metal residue that was rubbed onto the slate — not a procedure that Barry recommends you try at home. "It's dangerous," Barry says. "The acid can damage your clothing and your skin."

That's why Barry recommends you have a jeweler test your gold (if they do charge you, it will usually be only a nominal fee). If the metal rubbed onto the slate completely disappears under the acid, the piece is not gold. But if any metal remains, then it is gold, and the amount that's left can be measured to provide an indication of its fineness.

The results of both searches yielded thousands of results with pretty much the same info.

100 grains = 0.228571429 ounces. or if you do a search for "convert grains ounces" you'll find a whole bunch of sites where you can just plug in the number and the site will do the math for you.