Jewelry design

I'm a member of The Church of Jesus Christ of Latter Day Saints, mostly known as Mormons. We have several temples around the world that are very special to us, and I had this idea to make a small token as a souvenir or collection piece as we visit them. I would like to make a charm or pendant that would be models of these temples. The design should be simple with enough details just to tell them apart. I would like them to be no bigger than
12.7 mm, as they could be a part of a charm bracelet or necklace. Today we have over 100 temples, but I would start with maybe 10-15. I would like to know how much it would cost me for this designs as I'm trying to figure out what kind of investment I will need to make.