As if to add insult to injury, the Black Rose is not giftable at all. I couldn't give mine to Yukarin, and that sucks. It looks like people in countries that aren't whitelisted for the game will have to use the Achievement Manager if they want the knife.
Ah well. Worth a shot, though.
As for me, I destroyed mine. Since I used SAM in the first place, it didn't feel right keeping it. If I get VAC banned as a result, so be it.