The photos are all gray? And the photos are still hazy? Why is this?

In fact, there are several reasons why you shoot like this. First, the main reason is that there is something wrong with the lighting you took, so the outline is not clear. Secondly, your lens may be slightly shorter, so it is closer to the main body, resulting in too much reflection in the black part. Third, your exposure is seriously insufficient. If you want the background to be white and things to look shiny, consider flattening the light, reducing the contrast as much as possible, and then increasing the exposure. Shooting still life, especially jewelry, is actually very particular. I can't speak clearly in a few words. I can only tell you so much. I am a commercial photographer. Please ask me if you have any questions. I increased the exposure of your film. See if it's better, because your own piece is black and the edge is not obvious, so it's a little hard to lift it.