Okay, our diamond had come loose from its prongs, we took it in to have it tightened, when it was picked up, the diamond looked a little cloudy or darker than usual. What can cause something like this? I wasn''t with my fiance when she took it unfortunately. So I haven''t had a chance to talk to the jewelers myself yet. Could it just be a dirty diamond?? It was always a pretty clear diamond, but now it looks a little bit dark. Could it be the way its sitting in the setting?? Any help would be appreciated. Thanks!!