cpirtle's got it...it's a 3" blade.
Sometimes the scales look like they've got a hint of purple in them, and sometimes they look grey/green/black. Depends on the light.
Speaking of the scales, we have a cat who goes absolutely batty when I let her sniff the scales. I can't smell a damn thing on them, but she'll paw at it when it's clipped to my pocket until I set it out for her to smell. Her ears slick back and her eyes slip from typical housecat stare into this mean looking Discovery channel-esque predator gaze.
Kind of creepy actually.... lol!