The Produnova -- a handspring double-front somersault -- has the highest degree of difficultly for a women's vault, a 7.0, and only five women in the world have attempted it in competition.
The difficult vault has already led to a horrific injury of French gymnast Samir Ait Said after she broke her leg on the vault in men's qualifying event on Saturday.
"I believe that practice makes perfect, and then it is not difficult anymore," she said. "My coach, (Bisweshwar Nandi) ensured that I practised extensively."
"In the last three months I did 1000 repetitions of the move," she said. "Now it is the easiest vault for me."
Dipa, who turns 23 on Tuesday, is the first Indian gymnast to compete at the Games since 1964. She had won a bronze at the Glasgow Commonwealth Games after landing the Produnova in her vault final.