That is one ding. I wonder if Hublot can repair it.
I always admired the Magic Gold. It is novel, fresh and inspiring.
One a side note, tantalum is pretty hard and not brittle. I once knocked a tantalum bezel against the wall really hard, and it did not sustain a scratch. Only the wall paint came off.
If the same impact were to a solid gold case, i believe it will just cause a big ding.
Did you know even diamonds can crack? A friend of mine told me this, that inherent microscopic imperfections in every diamond can slip on impact at the right angle.