I found a video on YouTube using cardboard (thick chipboard), black embossing powder and pearlex powders to get awesome looking jewellery pendants!
Here are my attempts so far…
For zigzag example
For a friend…
For me (left)another zigzag example (right)….
Nail file reserved for crafts to shape cardboard
Black acrylic paint
Black embossing powder and heat gun
Interference pearlex colours
Jacquard lumiere Gold paint