I recently purchased a beautiful 1/2 ct princess cut solitare from a pawn shop. This ring is set in 14k white gold and inside the band it is stamped Z(and what looks like a small D,P or O) next to it. I am wondering if anyone may know where this ring may have been purchased originally. The diamond appears colorless but does have a small black inclusion you can just barely see with the naked eye I seem to be the only one who knows it''s there since I saw it under a loop. Any suggestions are welcome, this is my first time to this site. I have tried to take a picture of it and am having difficulty. Thank you all and have a nice weekend.