He might have gifted a ring to her. But the ring in this pic is not his engagement ring. He has been wearing this band ring since long. Check the old videos of yhm n his interviews
Which ring are you talking about? The one on his left hand or the one on his right hand? You do realise he is wearing rings on both hands now, right? The thick band on his left hand has been seen since the serial began almost, while the one on his right hand has only appeared in the last couple of episodes. The right hand one is a smaller band, and has a heart in it. The one on the right hand is clearly visible in his picture of his three "wives" and him on the hand around Anita's shoulder. That is an engagement ring, and he retweeted about a diamond ring being given Ankita.
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