becc987 messaged me that for some reason her replies aren't posting. She says,
"I do not wear them. I find them to be very heavy around my neck. I have a friend who wants to buy them so I'm trying to learn more about them."
I am surprised to hear that they feel heavy as they are rather petite if I am judging the size right.
I think something like this new would probably sell at retail for under $100, if that helps. You can also take the necklace with you and see what stores in your area are selling similar things for, and discount it for being pre-owned.