Unfortunately you will struggle to find a store that will sell anything on consignment. My missus (a jeweller at Solid Gold) said that jewellery stores balk at selling anything that is not made by them. Jewellers don't want to guarantee any work that wasn't made by them as there are lots of unknowns that aren't detectable until things like resizing and repairs happen. There is also no way they will buy the stones, even with certification.

Best bet is to just hang onto it until another lucky lady comes into your life. Get it re-sized or melt it down and remade into another style of ring. I don't know what cut the diamond is, but you have a top shelf diamond there (clarity wise).

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