Harshada claimed the yellow metal with a total effort of 153kg (70kg+83kg) in the women's 45kg category, opening India's account on the opening day of the competition.
The country's shooters won all the available 12 medals on the final competition day of the top junior tournament at the Las Palmas Shooting range in the Peruvian capital of Lima.
The Indian trio shot a total of 10 to finish ahead of their German counterparts Fabian Otto, Felix Luca Hollfoth and Tobias Gsoell (2) in the gold medal contest on Friday.
This was Bhaker's fourth gold of the competition to go with one bronze, while it was the 14-year-old Kapoor's second gold of the championship.
Namyaa got 36 hits out of 50 in the final to finish ahead of silver-winning Frenchwoman Camille Jedrzejewski and Manu, both of whom ended with 33.
Earlier in the day, India's 14-year-old shooter Naamya Kapoor fired her way to the gold medal ahead of celebrated compatriot Manu Bhaker in the women's 25m pistol event.
After a underwhelming performance during the Tokyo Olympics, Manu Bhaker is back to winning ways yet again.
They have the option to travel but will have to bear the expenses out of their own pockets.
Malik was the only Indian Greco Roman wrestler to reach the medal round.
Ravi Malik though could not do much against Karen Khachatryan in the semifinal, which he lost by technical superiority.