Vtg Carl-Art 1/20 12K G.P. on Silver Bow 15" Snake Chain Necklace Red Stone

Vintage signed Carl-Art 1/20 12K Yellow Gold Plated Silver Bow with red stone. 15" Snake Chain Necklace Replacement fold over clasp by Coro The 12K GP might be 12K GF. However, it appears to be GP. (Gold plated vs. gold filled) Estate purchase Replacement clasp is a vintage fold over clasp signed Coro. Some metal discoloration consistent with age. I have not cleaned or polished this piece. It is "as found."