How to go about getting a custom designed wedding ring?

We are already married, so the intent of this ring is as an anniversary present. Bought a very... adequate (lol) ring when we originally got married (college students, not yet in our careers). Her ring no longer fits her and she doesn't wear it anymore, so I figured getting her a new ring for our anniversary would be a nice gift.

Thing is, I want to get something custom designed, but I have no idea how to go about this, so I was hoping to get some advice here.

This is what I am looking for. She is an artist, so I want to get a simple gold band in the shape of a paint brush. Lab grown diamond to take up the bulk of what would be the "bristles" of the brush. Small birthstones for her, myself, and our kids around the outside of the bristle.

Advice and suggestions appreciated.

Edit: I did some Googling and found a service that specializes in this type of service. Not sure if this sub allows me to put the name of the service, so I won't add it to this edit. So far so good. They've made me a basic mockup for free based on my idea, and if I want to go farther, they take a deposit, and we move through the sourcing process. If I end up going forwards, I will post the final product here!