I am wondering that if seller agrees to send the diamond to GIA for appraisal, and report comes back with the same color/clarity that was stated by seller, would the seller not want to sell the stone anymore? Most uncertified stones sell cheaper because color/clarity was not exact and many times seller was not sure. For example, A G/VS2 .87 round brilliant was quoted at $3100. If I have seller sends to GIA for appraisal, and it comes back with same color/clarity, if I were seller, I would be tempted not to want to sell the stone or charge the price of stone with GIA certificate.