The price of 14K gold per penny weight (DWT) is $20. For example, if your gold necklace weighs 10 penny weight (DWT), then your total pay out would be $200. Learn more about gold prices here: http://www.goldintomoney.com/calculator.
Of course, no business can pay you that full price. Some cash for gold type places only pay 60% of that number. A good pawn shop surprisingly will often pay 80%. To help you with this you should try: http://mayshinter.blogspot.com/