The main issue I have with this is the central placement of the subject. There are tutorials on the "rule of thirds" which would help you with the composition I think. Clearly this is a beautiful ring and it sure sparkles. But the sparkles are too hot. They wash out some of the detail. Subtle flashes of sparkle would be more effective. It looks like this was shot with the camera's flash. The dead on lighting hurts the effectiveless of the image. If your camera will allow, try natural light next time or a few softer lights rather than the camera's flash. Good luck.
To me this image does not show the jewelry in a way that makes it attractive to me, does not give justice to its beauty. Strange color, a blown out area and some lens flare.
Sorry I really don't like this, maybe its the cropping. Maybe if the whole hand was in or a tighter crop on the ring not sure, the glare off the ring also takes out a lot of detail. Ohh looking again I get the feeling of a foot with really long toes, must be the angle of her wrist!