Short story, my husband and I upgraded my diamond from a 1.27 to a 1.74. We had been waiting weeks for the jeweler to find us the "right diamond" within our budget. My original ring rated 1.8 on the HCA tool. The 1.74 which was picked out for us is nice, and we saw it in person but to our untrained eyes we don't know much. At the time the jeweler did not have the GIA cert...now 3 weeks later we are given it. It only rates a 4.8!!! I can't help but feel like we made the wrong decision. We paid $6k for the upgrade. Both are Triple X GIA rated stones. Here are the specs on the new ring: http://imgur.com/Wenugrn Could someone help give some insight please?