Very late in the game - I think I've been in denial, but none-the-less, I'll put it out there- has any one seen this necklace?:
It's a flat circular pendant about 2-3 inches around with a shell in the center - an ammonite. It was encased in a copper bevel with a hand-tooled boarder and hung from a brown suede string.
This pendant has big sentimental value to me. Prayers it comes back. Thank you, community!