What makes a roma dance roma? They are so varied... ;)

Instictively, I think of stomping. Seems to be a kind of red thread through all dances although I have the impression that it's not really common in Turkish style.

What about arm work? It is pretty present, except in ghawazi (is it an influence of the Egyptian dances?)

Spins? In Turkish and Egyptian they are also not so present...

Hip work? I don't know how much there is of it in kalbelya but otherwise it is present in all other dances, sometimes more, sometimes less.
I found this quotation: "[...] ...some women which they call Tchingueniennes, they are public dancers and while dancing they play castagnets or other instruments and perform for a few coins thousand indecent hip movements" by Jean de Thevenot, relation d'un voyage fait au levant 1665
It seems to refer to oriental gypsies since "voyage fait au levant" means "journey to the orient". Unfortunately, I couldn't find out which coutry is meant here...