Witchlight is a light, flat, smooth gray stone that emits light, giving off a pure white glow when held by Shadowhunters. All Shadowhunters carry witchlight stones to remind them that light can be found even among the darkest shadows, and also to supply them with actual light when they are literally among dark shadows.

Notes: Witchlight stones are said to be extracted from the same rock adamas is extracted from. The stone is affected by the presence of adamas, considered its "sister stone", and receives its glow from it, as though reflecting the light inherent in the heavenly metal. The stones are then broken up and polished by Iron Sisters, and Marked to make their glow a property that can be turned on and off at the will of the Shadowhunter holding them. Witchlight normally does not respond to the touch of other races except Nephilim