Looking to buy a 0l7 carat diamond engagement ring. Going to go for triple excellent cut, F colour, VS2 or SI1. Was hoping to put the diamond through the HCA tool to see what the performance is but one retailer is suggesting to go for a Hearts and Arrows diamond. Just a little confused so it would be helpful to know which way to go? Should I still put the dimensions through the HCA tool? Any help would be much appreciated.