Looking for guidance from a lighting master for jewelry photography

Three problems: shadows, reflections, and cool starlight

The solution is to use a studio lamp, black woolen cardboard, and place it directly under the jewelry box. Just a small piece will do. . Don't cover it all down there. There are two lights on the left and right, one for top light, and if that doesn't work, add another for direct light, so that you won't have the first two problems no matter what angle you shoot from.

Just add a starlight mirror for cool starlight. It’s okay to add a starlight effect without post-production.