You think so, do you?... Not sure how more accurate we can get it...I think we're going to be coming back to revisit this jewel at some point. I have a feeling that its true shape (top down) is something more bevelled and pointed in one half, and rounded at the top. More like the "Peacock's Eye" in a peacock feather. I bet Regal Robot end up pulling it from the Lucasfilm archives and shocking us.
Screencaps on the left, and CZ replica on the right...