It looks like a 1.35c so you will have an idea of what your stone looks like mounted!
A culet of .6 will not change your score on the HCA. Play around with it and see for yourself. You would have to have a culet of something like 1.5% for the HCA to penalize you. Your 1.2 is very EXCELLENT!
CONGRATS!!! Post pictures when you get the finals!