Identifying a Brooch?

I am not seeing any types of marks on this to tell me if it is silver or something else. This could be a vintage brooch and it is hard to say who make it or the real value of this by the photos alone.

I don't see any maker's mark and the metal doesn't look like it is a precious metal. I can't tell what the cabochon is made of from the pictures. It could be plastic, resin or a semi-precious stone like tiger's eye. A better picture would help us identify what it is but I think it is probably just a piece of costume jewelry. It probably isn't worth much but you could check with an antique store to make sure.

I believe the jewelers mark on your broach is the mark belonging to Catherine Popesco. A French jewelry designer famous for handcrafted vintage designs as well as some more modern pieces.