I've been searching online and so far it seems only Blue Nile verifies the 'signature cut.' Does anyone have any site recommendations for buying an ideal cut diamond? I'm specifically looking for a 2 carrot, D or E, vs1+, asscher cut in the 20-25k range. Thank you for your help!
If you want an asscher, I'd highly recommend contacting Jonathan at Good Old Gold. You can't buy a fancy cut "by the numbers", and there is no such thing as an ideal asscher - just variations in style, some with better light return than others. I'd let GOG know what you are looking for, let them call in some candidates, and vet them for you. They can perform all kinds of light performance tests and even make you a video to compare them.
Whiteflash is fantastic for ideal cut modern rounds, but for an asscher you will need a bit of help. Call Good Old Gold -