I am always leery of giving a knife as a give. In Chinese culture (in fact many cultures), it symbolizes cutting the relationship bonds. You give a knife to indicate that you are no longer friends. A fact that was pointed out when I mistakenly gave my father a pocket knife for Christmas to replace a worn out SAK that he had.
Can you say - "Oops!"

IIRC That's why you need to give a silver coin back to the person who you get the knife from. 'so that the knife doesn't cut friendship'