You can try to do it yourself. To be a teacher, some jewelry outside can only be superficial decoration. You can make a bookmark for the art of knotting, or give the teacher a nose, tie your own tassel and choose a pen for the teacher. Pen or brush depends on the teacher's usual preference. I think these will be more meaningful. It is not cheap to choose the best materials for these things. Just do what you can. Friendship is the most important thing that money can hardly buy. It still makes sense.