Vintage gold finish Shell Cameo locket necklace

Vintage gold finish Shell Cameo locket necklace antique pic inside some discoloration inside and on the back the plastic bezel inside looks compramised appx 1.8” locket The necklace is 26” loss of finish on necklace it appears antiqued good cond and presentation except the metal discoloration:tarnish on inside and out on back preowned appx 1960s J2023-118