I have a pair of 18k gold earring and can't seem to identify the maker's mark.

[pctreasure]

can anyone help identify this maker's mark?

 

[jewelerguy]

either your lighting is causing a shadow effect, or your piece is plated with the plating wearing off

 

[pepperj]

First thing I saw as what Jewelerguy stated, looks like it's just plated or it's the lighting.