Designing a Shattered Crystal Pilgrim Badge Part 1 of 2

I have been wanting to design a Pilgrim Badge for Crystal Ball as a semi standard site token, the Idea being that it could have a hole in it that a date could dangle from it. This is my learning piece I haven't done one of these before. I am reversing the pin back so it is poured into from the top down here it is still backwards and that is what is causing the hole in the front. After I am done and it works I will weight it and then decide if I want to remake the whole things smaller which I might do just because I can and to see how small I can make a piece. I also may play with trying to make one that is lacy on the inside on a frame work of the diamond. But I don't know if I can make the pin back work the way I want so I will cross that bridge when I get to it.

Thank You Master Philippe for the advice of the mold and pin back.