Have him contact Wink at Continental Diamond in Minneapolis!
About a six hour drive to get a Legacy diamond cut by the same team that cut diamonds for Wolf/CBI.
Also bear in mind that sellers such as Whiteflash, Brian Gavin, and Victor Canera are well established brick and mortar locations...they just happen to list/sell their in-house/in-vault diamonds online so people outside of their immediate vicinity can buy and enjoy them, as well.
It's for a fancy cut and he's having problems visualizing size and setting by just looking online. I wish he could visit me before he plans to propose. I'm a drive across town from Whiteflash and Brian Gavin.