Okay, so here is the foundation for the crown:
https://40.media.tumblr.com/273c4537ce0ab93d898b6c360e99e05e/tumblr_nujjufE44M1r8nupyo1_540.jpg
Here is my sketch:
https://40.media.tumblr.com/3628de67535d8502ee1bbf297920bbd2/tumblr_nujjwmX7Qb1r8nupyo1_540.jpg
I want it to look like the foundation with the little tweaks I added then in the middle area where I wrote "marble", I want it to have this design inside of that: