Lost & Found

I found a ring in the street (mentioning the street) and posted it on Facebook, just as a show and tell. Seven people contacted me saying it was theirs. They have a photo of the ring, so they can describe it and know the street so they can say they lost it there. How can I know the real owner, if any of these are?
 
I took it to a jewelry shop. They said the stones were not diamonds (but didn't elaborate). I posted this as a follow-up message on Facebook. The demands to return it suddenly stopped.
 
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