I second this.
diamondtalk.com was HUGE when me and my now husband were shopping for rings.
I met an awesome jeweler who found my diamond and designed my ring. I am in NY and he is in Memphis. We did everything via e-mail. My ring was PERFECT and my diamond was well below what Fortunoff wanted to charge me for the same thing (I have a branded Royal Asscher)
He was with me through the whole process and 5 years later, I still e-mail him if I have jewelry questions. The forum is made up of jewelers and jewelry fans alike and all are willing and happy to help you in this big investment.
Also, FYI, bluenile.com is NOT looked upon favorably by the overwhelming majority of the people there.
Good luck!
YEA!!! another diamondtalk.com fan! it's a WONDERFUL site.
and bluenile, to me, is NOWHERE near as good.
JMHO.