Aluminium tape

Using acrylic, I made a batch of decorative gems for craft projects.
They’re on Thingiverse at

I was cutting these in clear (or tinted) acrylics with a backing of silver or gold cardboard.

While trying different materials, I found a nice looking and cheap combination. Laser-ply covered with a sheet of thin aluminium adhesive insulation tape. Etching burns away the tape to leave tiny scorched mirrors.
It reminds me of Indian Shisha mirror designs.

This kind of tape:

(Usual disclaimer about lasers, hazardous materials, safety, etc)