Like a round brilliant, cut quality of the emerald cut depends on its angles and proportions. Large depth and table percentage ranges will include combinations that work well together and combinations that don’t. ROSI eliminates all diamonds that are outside of 58-75 depth percentage and 56-75 table percentage and then chooses combinations of proportions that provide the brightest possible gem.

ROSI generally recommends a depth percentage between 61 to 68, which is the best balance between brilliance and size (the less depth, the larger your emerald cut diamond will appear.) ROSI usually recommends a table percentage of 60-69. ROSI always recommends very good to excellent polish and a very good to excellent symmetry, which together indicate a well-crafted diamond.