In the eighth round, Gujrathi, with an ELO rating of 2687, scored a 40-move win over Chinese GM Jinshi Bai to move to the top.
Four other players are also on six points including three GMs from China.
Among the other Indians, S P Sethuraman and Aravind Chithambaram are placed 10th and 11th with five points. B Adhiban is in 15th spot while his Tamil Nadu teammate Karthikeyan Murali occupies the 16th place.
Vo, with seven points is half-a-point ahead of her nearest rival, Guliskhan Nakhbayeva (Uzbekistan) at the end of eight rounds.
Another Indian Mary Ann Gomes (5.5 points) climbed to the third spot after a draw with Vietnamese Le Thao Nguyen Pham.
One more round remains to be played in the tournament.
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