In the 3rd episode, Abir finds one of the earrings and keeps it with him. He tells himself that they both met to help each other. And the best part is they never saw each other's faces. They kind of know each other through the pain and the banter. And both have their own image of the other person.
She will not wear those earrings as she thinks she has lost one of them. Since he hasn't seen her, he will not know that the earring he picked up belongs to her. And Meenakshi dislikes the person who wore that earrings, but has also not seen Mishti's face.
I feel that, that earring is going to make a difference when the truth comes to light. It is going to change lives.