My dad has the Sandshark. He found a 14K white gold ring at the beach (at least, thats what the markings say). It has 4 small diamonds in it. We are not sure if they are real though. He also has two other 14K wedding bands he found with it, and no diamonds. I ran the two bands across my Cibola and my brothers Compadre and it picks it up fine just below the 5cent marking. But the "diamond" ring wont pick up till i turn it down to iron. This is all air test. Why does it do this? Also, why does it not pick gold up at the 5cent mark? It picks the bands up halfway between iron and 5cent. I got the detector last year. Any help would be greatly appreciated!! I hopefully going to try the beach tonight. Happy Hunting!!