My original Jewel design was created in Blender. Ick! (At least, ick for 3d printing.)
https://www.thingiverse.com/thing:222817

I decided to roll out a new one in opscad and make it cutomizeable.

It includes an optional bottom hole, so you can screw this on as a drawer pull or put an LED inside to light it up.

A little more info on my project blog if you're interested:
https://theheadlesssourceman.wordpress.com/2020/06/09/customizable-jewel/

There may be sharp points, so be sure to blunt those with sand paper so nobody gets hurt.