I think that Dark Chrystal purple extends all the way to the edge of the falls. Go to irises.org & click on the iris encyclopedia for it. It is at the bottom on the left.
Debra got her Dark Crystal from me, and see the difference in how location changes things. Her's seems to have a lighter edge, and I don't see that as much on mine.
Name: Bonnie Sojourner Harris Brake Lake, Arkansas (Zone 7a) Magnolia zone
I have some to suggest but it would really be wild guesses not knowing if they are SDB's or MDB's and if color in photos are correct. And like Tom said color and pattern will slightly vary from different regions. The third one is a bi-color and easier to narrow down that way.
Thro' all the tumult and the strife I hear the music ringing; It finds an echo in my soul— How can I keep from singing?