this might seem like a tough call for you fella, after the condolences have passed all you have are the memories, they are yours forever. The gift however is merely a material possesion, albet with memories attached. I personally wouldnt want to part with it, but I agree with the earlier sentiment of rather than selling, pass it on to your friends family, but be careful, it might offend if they feel you are willing to give away such a gift.
Im sure you will make the right decision for you, but make sure as it cant be replaced.
take care
dolph