Named after the resplendent Northern Lights, which in Aboriginal myth illuminates the night sky like a brush of undulating fox tails, the Foxfire diamond is the rarest of its kind. At 187.63 carats, the two-billion-year-old stone is the largest known, uncut gem-quality diamond ever to be discovered in North America. With a unique luminosity, the Foxfire gives off a singular glow, appearing to actually emit light.