BTW you will have little to no say in the process. Just go with whatever she requests it will make your life easier.
They stayed open past their normal hours so that my girlfriend and I could make it down. They sourced 3 purple sapphires for us so she could see, and 1 of which was absolutely gorgeous. My girlfriend loved it, and it's what I ended up going with. Putting a payment down next week.
But the best part appeals to the nerd and engineer in me. They do bespoke rings, fully in-house. They will customize the ring to any design you want, to fit your finger and the gem. That way, it's not only designed the way you want, it's made to uniquely fit you.
They design everything in CAD, and iterate with you via e-mail. Then they print it on their 3D printer, where you have a chance to go in, see it in person on your finger and with the gem. If changes are needed, they can iterate again. Otherwise, they go ahead and make a plaster mold. Then they melt the metal (i.e. gold, platinum) and cast it. They have all the equipment for this in-house in the back of their store. Honestly, I haven't been more excited about buying a ring than now. I'm super happy I found them.
Not sure how old you are, but I have also noticed this trend in Gen Y (friends like myself) starting to get colored gemstones. Of course this is totally anecdotal but maybe De Beers stranglehold is finally going away?
Congratulations as well by the way.