Thank you for your reply Mara.
I have seen the stone offline - and it is certainly eye-clean. I will be buying it offline as well - for $1200, and that sounds like an unbeatable price from the information you presented. I have the OGI specs on it. I don't have a cert, but I will be receiving a written guarantee from the dealer that he will purchase the stone back from me for the full purchase price ($1200) at any time (he says that he loves to have stones like this in his inventory - he can sell them very easily, so he doesn't mind to buy it back because he can always resell it). I have compared the color of the stone with a set of master grading stones (and other diamonds as well). When I take the stone for appraisal and/or certification and if I get a report that says the color is actually 'J' and not 'I', I will just return it to the dealer and get my money back.