The gist of the scam is that you send them your old crappy gold jewelery (I'm looking at you, holiday brooch), they melt it down, and mail you a check for the value of the gold. How do I know it's a scam, you say?
This is how: the Cash4Gold guy was so hard up for people to endorse it, he had to use HIS OWN MOTHER in the commercial.
Exhibit A - Cash4Gold guy

Exhibit B - A woman who is clearly his mom. Or the Cash4Gold guy in an old lady suit.

Look at the schnoz. Look at the lips. Look at the eyes and the expression and the X chromosome. Look at how badly they both want you to use Cash4Gold.
Stats: Free ninety nine. Supposedly you even get money back.
They accept the gold, platinum, and silver jewelry.
www.Cash4Gold.com
Pros: Way to get rid of hellbrooch.
Cons: Scam.
Verdict: Buy! Er... send! But only if you won't be mad if all you get in return is a heap of shame for being taken by a snakeoil salesman and his mom.