Purple blade. Of course. Shorter and stockier.
Metallic silver handle that had a large crossguard made of the same material, but the guard would have a core of cortosis ore.
I remember a time when lightsabers had a much better technological explanation. Back when there were only three known in the whole universe: Anakin's teal (fine, blue) one, Vader's red one, and Luke's green one. It was explained, then, in the early expanded universe stuff, that the color and length/girth of the lightsaber depended on the size and the spacing of the two crystals used.