The name of a atmospheric phenomena that occurs during a light, small-particle snow-fall and its exposure to sun.
1----The refraction from the falling snow-flakes create brilliance and flash for the viewer.
2----The refraction also occurs after a snow-fall as the newly fallen snow on the ground creates sparkle through-out the area.
Both instances sparkle like diamonds...
NOTE: difficult to image such an event unless one has a very sophisticated camera...which I do not.