Hi there. I hope I'm posting this in the right spot.

I was wondering if there is some way to change the color of just one iris. There is probably a simple way (I hope) but I can't figure out how to do it. I found a item by Sabby that has mixed color irises but, although I love that artists work, the colors aren't right for what I'm trying to do, so I thought I'd see if there is a way to do it manually? I'm really new to this so any help would be really appreciated. Thanks.