You shouldn't buy someone fake jewelry.
Peter is shopping for an engagement ring for his girlfriend, Sue.
Peter wants to give Sue an engagement ring.
Peter gets a ring with a real diamond, even though he has to save up longer for it.
To save money, Peter gets a ring with a fake diamond instead of a real one.
Sue loves the ring, and she agrees to marry him.
Sue finds out the diamond is fake and breaks up with him because of the deception.