Strangely enough, no, I can't seem to Leave it on the ground. You can leave just about any other non-covenant ring on the floor, though. I wonder why. I was going to try to make a new character, get him to the white soapstone without killing a single enemy, then drop him the ring on an alt for a zero-soul run through the game. I guess you need at least 5,000 souls to buy it from Straid yourself. effin' eff, mothereffer.