Gold is currently selling for around 934 an ounce. A 20% commission would be 186.00!! I don’t think so!
Gold and Silver are very viable ways of protecting your wealth. Alan Greespan wrote a very interesting paper back in the 60’s that you ought to read. http://www.gold-eagle.com/greenspan041998.html
Now there are always people willing to rip you off but that can’t happen if you are educated. Any reputable dealer will give you a fair price.
http://www.golddealer.com/bullionpage.html
Lets take California Numismatic as an example. If you have a one ounce Gold Eagle they will actually pay you 16.00 an ounce above spot price, or 950.00. If you want to buy that same coin from them it would be 980.00. The difference between 950 and 980 is the commission. According to my mathematics that is somewhere around 3%.
Again, you can find plenty of people who will charge you a 20% commission but a reputable dealer won’t.
As far as your rings and Jewelry you will likely only get melt value. Being that it would need to be processed, even a reputable dealer will probably pay a fair amount below spot, but not more than 20%.
Good Luck