Scintillation of diamond is the altering display of reflections from the polished facets of the diamond that is seen by the observer when either the light, the diamond or the observer is in motion. That is, a flashing or twinkling of light from the factes. The degree of scintillation is directly related to the:
- Quality of facets on the diamond that will reflect light to the eye as the diamond is moved
- The quality of the polished surfaces of the facets
- The brilliancy of the diamonds and thereby the quality of light that is returned to the eye after entering the diamond, through the crown.