I looked at gemappraisers.com. There are charts for grading fancy cut diamonds. A lot of pricescopers also said that your eye is the best judge for emerald cuts, and I totally agree. I saw several stones with better numbers according to the charts that just didnt impress me as much as the one I have. I saw deeper stones that I liked, too. I would stay away from really really large tables. They looked pretty glassy.