I’m going to a GIA gemologist Friday, I will see what she has to say but I’m not sure what is meant by tone is flat.Do you “love” it?
if it isn’t “loved” for $5,600 I’d return it and keep looking.
While I think the cut is fabulous, the tone is flat to me. I prefer a bit more vividness. And $5,600 is a hunk of money to spend before setting if it isn’t ticked all YOUR boxes.