A mirrored silver paper is usually too reflective for jewelry shots. For this look, a better match is likely a matte metallic surface such as sandblasted steel, brushed/textured sheet metal, or a shiny-but-grainy plastic/laminate surface. The goal is a silver background with texture that scatters reflections instead of acting like a mirror.

Good options to try:

• small sandblasted steel plate
• textured or brushed sheet metal
• metallic decorative adhesive film applied to a rigid board
• hardware-store plastic/laminate with a fine metallic grain

If you want real metal, a local metal shop may be able to sandblast a small piece for you. If not, decorative metallic foil on a flat backing can give a similar effect at lower cost.

Also remember that lighting matters as much as the surface: diffuse light will help keep the background soft and prevent harsh reflections in the jewelry.