For jewelry, the bigger issue isn’t just the background—it’s controlling reflections. An all-white setup can make silver look flat and kill sparkle.

Based on the answers, a shooting tent/light tent is the easiest route for fast, even tabletop lighting. Use diffused light from both sides, and light the background separately so it goes pure white without forcing the jewelry exposure too high. Another simple approach is to hang the jewelry several inches in front of a white backdrop, then use separate lights: some for the jewelry, some for the background. Expose for the jewelry, not the background.

To restore shine, add small black cards just outside the frame or above the piece. Jewelry reflects its surroundings, so those dark reflections help silver look lustrous instead of dull, and they increase contrast in gemstone facets.

So: a diffused tent or similar setup plus separate background lighting will likely make your life easier than relying on an all-white reflective setup alone. Keep some controlled dark reflectors in the scene, and you should get a white background with better sparkle and much less post-processing.