Hi, I was just at a diamond shop and was shown a diamond that matched what I was looking for. However, the diamond came with a GIA-certified portfolio, but I was told that the serial number was not on the diamond for some reason. He told me he would send me to a gemologist to get it looked at so I can match the diamond with its imperfections and size and what not.
This is a reputable diamond seller so I trust him, but I think it’s weird that a GIA certified diamond would come without a number. I got a good deal, but not so great that the diamond is probably fake somehow.