He designed that band with Damiani jewelers. I didn't find it on the Damiani site, but here's an eBay link that provides some good photos of the ring's details:
Oh yes the ring....um I believe WF and BGD makes a version off the top of my head. however, I have ordered bands before from eweddingbands and they are pretty spot on. Plus they have a very good return policey. So if you don't find anything you like better then EWB is definitely a great way to go.
That's the one from his marriage to Jennifer Aniston? It was Damiani and designed by him with Damiani and spurred a huge lawsuit when the company sold a variation on the design without the couple's involvement or approval.