I took my grandson metal detecting today. He has been out twice with me. Each time he uses my backup Garret Ace 250. Today we had been out for about 10 min when he came running over to me with a big smile on his face. He had found a ring with 13 stones, which said 14 kt GEG Tiawan inside the band. I have MDing for several years and never found a ring like this. Is there a way to tell if the stones are diamonds or CZ's?????????