Hello : I wonder if one should be concerned if GIA certificate can be duplicated? How to check if it is authentical? I know they changed the certificate in 2006 and the GIA nr appears on the left side now, I am considering to buy certified stone and I was told " not too worry about the certificate " as I have one week return policy if I am not happy? I did receive faxed certificate( Gia dated in 2006) , but it was a poor quality fax and definitely had no nr on the side only on top and inscribed also . O boy am I ever so confused now. B 4 I " pull the trigger" on that one please give me some advice ( should I worry or just get it and have it appraised with one week return policy) I did ask for a faxed copy of the certificate ,but they had very casual approach.When I punched the carat weight and Nr on GIA site it showed up exactly same diamentions as I was faxed to me I think ( from what I could see on the poor quality of fax) Any imput would be appreacieated has anyone seen gia dated 2006 with no nr on the side? Many gracias...