How to unstick a 14kt gold necklace clasp?



I have been wearing a 14 kt gold necklace that has not been taken off years and the clasp if very stuck and will not open to take the necklace off. Any ideas of how to get open the clasp with out breaking?
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Not sure what kind of clasp. But a little cooking oil or WD40 on the clasp should work.
if the oil doesn't work it's probably caked with gunk put some Dawn dish soap on it and use a toothbrush then start trying to open it slowly working it back & forth. what kind of clasp is it ? Lobster claw,circle/oring,spring ring clasp? if it is not soldered you could always gently bend it(clasp) open and slide the clasp off of chain then put it back on/together.