You're a dealer, make a specific offer for a specific stone that you're willing to sell and that you think is comparable. The cheapest GIA/0.45+/J/VS2/xxx without fluro that I see in the database is one from Blue Nile at $898. That one makes no claims about 'hearts and arrows', especially good proportions or other special attributes that may or may not be important here but surely the one above DOES make that claim. Caesar didn't say if that's one of his specs but, given the stone chosen, it seems likely.
I notice that you're not a 'verified jeweler' from the admins and it may or may not be against the rules for you to post an offer in the forum but take a stab at it. You just might get a sale and your suggested $700 offer (15% below $828) would indeed be attractive if it's truly comparable goods and you're selling terms and conditions are reasonable. If you get deleted you can blame it on me.

While you're at it, talk to Hermann or LaurieH about how to join the club. It's free. If you've got a big inventory, you might even consider participating in the database (which isn't free but I'm pretty sure it's reasonable). Have you got a website where you sell diamonds to the public?
Edited by denverappraiser, 05 November 2011 - 09:23 AM.