very pretty !! though a funky side view..the stone looks squashed.
one thought is that a site like a fortunoff has rings like that but without the center stone. I wonder if you could get something like one of their settings, and have a designer take that setting and add a head onto it somehow for the center stone. Hmm. Maybe cheaper than having it custom?
Interesting and I haven't seen many/any like it. But, do you want diamonds all the way around? It would seem hard to carry anything in that hand, but maybe I'm being too practical...But, if it were custom made, you could consider alternatives.