There I s 20 pennyweights in one ounce of gold. So divide the current pics of gold by 20 to get the price of a pennyweight; so if it's $900 OZ then it would be $45 pennyweight . If your selling gold to a pawn shop or one of those cash to gold companies then I would say getting around 35% of the current value of pennyweight is a fair deal. Just make sure that when they are weighing your jewelry and calculating how many pennyweights it is that the don't mess up. Three is a fairly easy method to use to find out how many prnnyweighs a piece of jewelry is. All to need to know is how many carrots (I know is spelled wrong) and how much is weights. Getting 35% of the pennyweight is a good deal; which means that if the value of. Pennyweight is $45 then getting $16 would mean your getting good deal. Anything less and they're just ripping you off. Hope I was able to help! Good luck