That's not how you buy EC's or fancy's in general, they are not MRB. The angles on the lab report are just information. We need a video, and the lab report. And pictures too, if you can get all three.
Do a search for "ideal Emerald cut" under here. This is a better place to search than 4's. There are literally decades of information here to read. Look for Karl's posts as he is the EC expert. He probably has more than one article here too on EC's and step cuts in general.