Marriage is a major life event, a very festive thing, and giving gifts is also a customary custom in Chinese marriages. However, if your classmates don't let you give gifts, don't do it. Don't force yourself and embarrass your classmates. So giving a small gift is also a good idea. I can give you some small suggestions:
1. You can buy a pair of big teddy bears, of course, it is the theme of marriage. I believe that such a big gift is conspicuous enough at the wedding banquet, and friends will be very surprised, and girls will like such things very much.
2. You can also give him a pair of gold wedding ornaments, which can be given as a gift and as an investment. It will definitely make his wedding magnificent and look good on his classmates.
3. You can also ask for a pair of jade pendants for them, which means pairs. Of course, jade pendants with good quality are also expensive, so do it according to your ability.