This one is a step-by-step from a few years ago. I got a new idea for some jewelry, based on this principle.
I folded horizontally and diagonally a firm piece of paper. With latex I made a mould and casted my tile in it.
I'm aware of some of the flaws, it was interesting to look back at this project for my future ideas!
My second hollow ring! It is NOT finished, there are little dents (black spots) and it's not fully polished yet, but I wanted to share this any way. The first picture is more of a WIP.