My first attempt at remixing anything. I still can't combine these files, but I hope to learn that one day and update this.
For now, print the egg portion at 68mm, and the ornament at 10 mm tall, and glue them together.
I modeled the ornament in fusion 360, and it's the first thing I've ever modeled. I used Meshmixer to smooth out the round area for the front of the gem.
I plan on uploading Madoka's and Kyoko's soul gems as well, so keep an eye out for that!