Thanks for everyone's feedback! We are moving forward with this in both Pink and Kashmir Blue sapphire, from roughly 6mm - 9mm H&A rounds.
Our cut designer has already been working on an H&A cut for sapphire so there won't be much R&D left on that side...I'll post out a few photos of some natural ones he tested on shortly.
To answer Lorrissey's question - yes, the H&A rounds will 'outshine' the diamond cut.
According to our cut designer, the H&A sapphire is quite brilliant overall. In fact, I think these will end up being basically the most brilliant sapphires in the world since I don't believe anyone else has done this before (H&A cut for sapphire).
Since we're moving forward with it, I'll start a seperate thread to post the two example photos and links to the two product pages.
Thanks for the feedback!