Hello,
I was looking at the mahasangam episode and noticed one thing: This is already mentioned by many people in this forum , but it is just confirmed for me by seeing the episode.
The pendant says TV for tan veer. First letter is not I. It is a cursive T letter where the straight line is turned like J and the top of right side is moved as a start of v letter. If you cursive T letter and screenshot of the pendant then you will know what I am saying. It is definitely not the letter Z (upside down) or N that is for sure.
Also Tanveer also wears similar texture of gold chain in her neck.
Now why Imraan still wears it: I think there might be 2 reasons for that. I
mraan truly genuinely loved tanu but it was tanu who left him.( as shown in the earlier episode) And that is the reason he is angry at tanu for leaving him and now she is trying to get married to a rich guy. So he shows the tough/sarcastic exterior in front of tanu the way tanu left him but he still cares and has strong feelings for tanu.
Another reason might be It is gold chain. Since it is gold he is keeping it not because he loves tabu. He loves gold. As they have shown either because of haseena bi or his nature he is little bit materialistic and he digs gold. Because after Nikhat/ Him staying in the hotel drama he broke of his nikah ( haseena bi did it but he did not protested to that ) with Nikhat but they did not return the car they got from Nikhat's family. They kept the car which later Ayan tried to burn it. The same way he is keeping the gold chain. Whatever goes to Haseena bi family they use it, flaunt it but never return it.