You won't get as much from it as you think; most jewelry is 14karat or less, meaning just a little over half gold. The European system is slowly starting to take over on some things, where they label 18 karat 750 (75%) etc. If I remember right, 14k is 560.
Make sure first to weigh the jewelry as accurately as you can, just so you have an idea. Then figure out how much actual gold is in that weight by doing some analysis of the karat numbers on the jewelry. You can probablly google a karat converter to the 750, 560, etc. numbers I gave you. You will probablly not be exact on weight or content.
Next, your gold will have to be assayed. Essentially measured for pure gold content. Assay fees vary widely, and can be brutal. The radio ad places usually will totally screw you. Best to call a gold dealer in your area and ask about a reputable dealer or assayer who can help you out.
You of course will get paid based on what the assay says, and the melt fees of getting the gold out of the other metals, even if the place you sell it doesn't have any intention of melting it.
I can't help you with exact places to go, but I imagine if you called California Numismatic Investments in Los Angeles, they could send you to a reputable place.
You may be able to have your local jeweler weigh all your gold and give you good figures. It's even possible he'll give you your best deal. Frankly I would use his weight and content figures and call a few places to find the lowest assay costs and the lowest fee for melt and scrap value. You will not get spot prices. Most likely the best case scenario is 1.5% less than spot, and much more likely you will end up getting approximately 90-95% of spot.
Good luck. Just don't rush it and get raped.
Incidentally, you may have some luck finding a local gold bug that will melt and keep the gold for himself. This is a guy who wants to beat the spread of coins and bars and will go bargain hunting on his own. If you go this route, be very very careful and meet in well-lit public places only carrying a small amount of the gold you intend to sell. There are at least a handful of down-to-Earth goldbugs scouring any local market for mutually good deals, but there are at least an equal amount of scammers and outright thieves.