Okay, I hate to pile on here, but GIA does not "certify" appraisers. Your appraiser probably has some GIA education, preferably a Graduate Gemologist Diploma, but they are not allowed to say they are "GIA Certified".
Very few appraisers have enough experience with pearls to give an accurate evaluation, so it is much better to send the strand in to GIA to have the strand evaluated with a Pearl Identification Report or the complete Pearl Classification Report. GIA issues reports, which are opinions, as opposed to certificates, which imply that the lab is "certifying" the object.
That said, you are very welcome here if you can keep an open mind. No one wants to attack anyone unfairly. You may well have been mislead about the pearls you purchased and that is good information to have. It would be a sad thing to ruin your reputation over a strand of pearls.
Let me add a note: I just read the rest of your posts. Now I can see why you are being treated as an aggressive salesperson. You may think you are being subtle, but you are not. Pushing your product, particularly when it's questionable can get you kicked off the forum. That would be a sad thing.
Best of luck to you.