My vote, locket.... I can even see the picture of the woman or a man...Its silver, not copper, maybe gold look close for the 18K, 14k #'s etc...You can use the VDI from your detector...Not sure if your Bounty hunter works that way....Like my Whites...
I don't think its half of a locket ... the material is more like a soda cap..the picture is of an old queen or king... I'll see if i can get better pics