Tobias Wong designed a line of engagement rings with the razor-sharp diamond pointing up. He believes that the engagement ring, long a symbol of unholy matrimony, should also be able to maim and/or kill. When fitted with a 1 karat or larger diamond, the otherwise unimposing ring becomes a lethal weapon. I like it, but already have a deadly ring. Sure it's just my plain gold wedding band, but it's definitely killing me. Slowly. I like to call it my torture ring. Horrible, horrible mistake.
Killer Engagement Ring by Tobias Wong [yankodesign]
Thanks to James, who has never shanked anybody who didn't deserve it, for the tip