To make diamonds and gemstones sparkle, use Jewelry Photography Lighting combined with diffused fill light. A small, focused light source (like a spotlight or snoot) placed at an angle can create highlights and reflections that mimic natural sparkle. Adjust the angle until the facets catch the light just right. Avoid overexposure, and use a reflector or second light to fill in shadows. Experimenting with lighting positions is key to getting that perfect shimmer.