Glitter usually looks dull under fully diffused light because sparkle comes from tiny specular highlights. A lightbox is good for showing the item’s overall shape, but you’ll likely need some harder, more directional light to make the glitter pop.

A practical approach is to use two looks:

• a soft light exposure for the object’s form and color
• a hard point-light exposure to create bright sparkles

You can blend/stack those exposures later if needed.

If you want to do it in one shot, try a longer exposure and move a small light source in an arc during the exposure. Changing the light angle helps different glitter particles and holographic surfaces catch the light, which can reveal more sparkle and rainbow effect.

Also experiment with the angle between camera, subject, and light. Holographic effects often appear only at certain angles.

For a more stylized result, a star filter can exaggerate the glitter highlights, though it gives a more obviously “effect” look.