What can you gift to a man who has practically everything?

My friend is getting married in a couple of weeks and I am unable to decide what can I gift to him. Both of us are college friends who have stuck around even today. The thing is most of the things he would like to own he already does. I can't even give him cash envelope because I'm not sure whether Brahmin families would like that. Also he significantly outearns me so not sure a cash envelope would be useful for him. I want to gift him something he would use(Budget around 10k). Some information about him: He is a teacher, owns his own coaching institute, plays guitar and keyboard. Likes to sing. Please give some suggestions