Fingertip Armour Ring

You put one on and your hand stops being a hand for a second — the tip of the finger goes metal, nail and all. The plain cap reads almost like armour, the dripping one looks poured on and caught halfway down the nail, and there is one with a small bow sitting on top. Sized to the finger rather than the knuckle, so it grips the tip and stays put through a coffee. Wear one on the little finger for a hint of it, or run the set down a whole hand.