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It's not so much the fact that the handle on this knife is made from bone that has me worried… no, it's the artificial-sapphire blade that sets off the alarms. Or rather, it doesn't — since the knife has no metal in its construction, it won't set off any metal detectors, should an owner, say, try to bring it aboard a plane. The only substance harder than the scratchproof blade is diamond, so the knife needs a special diamond whitestone for sharpening. That might be a skippable accessory, though, since it seems likely that such a blade wouldn't need to be sharpened that often, unless the owner happens to be a really prolific terrorist… er, knife user.