What sort of lighting are you using? I have in the past shot some jewellery for a client and the best solution or setup that worked for me was to place a defused flash directly above the product and play about until you have it spot on. The closer you can get it in camera the less pp you will have to do. Oh and the closer you have a defused light to your subject, the softer the light will become and the nicer the shadow details will appear.
Hope this helps
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