[John Smith_]

welcome to the forum, Fabian.
what kind of projects do you anticipate making with your CNC ?
and we love photos of projects = from the beginning designs to the finished product.

 

[John Smith_]

there is a guy on another forum making those that have a polished stone in the center.
he is using a forstner bit in a drill press for the recessed part and all the rest of the shaping is done by hand.
if you are to use the CNC, you would have to make your pattern where you can make a dozen or more in one piece of wood, make the cut-out, then hand-shaping and sanding on each piece.
some hands-on woodworking is involved in a project like this to make each piece distinct and different.
will you be selling these en-mass or just for gifts to friends, etc ?

 

[John Smith_]

there are many of us here that do hand-routing, using different profile bits to get the job done.
one bit in particular that I would consider is a non-bearing roundover bit (a/k/a Bead Bit or Plunge Round Over) to do the outside rounding which could also cut out the final shape. how many will you make at one time ? how thick will the wood be ? depending on the thickness of the wood and degree of the round-over, this bit would also help with cutting the pendant completely out of the main wood.

 

[John Smith_]

I just pulled the photos from the net as an example of what might work for you. (the link I gave you to Amana Tool has many to choose from and are of good quality).
I have these bits in the common 1/4" shaft - so I know they are available - just google what you need.