When a cut diamond is illuminated with white light, it sparkles brilliantly with a spectrum of vivid colors. These distinctive visual features are a result of (i) light traveling much slower in diamond than in air; (ii) light of different colors traveling at different speeds in diamond; (iii) diamond absorbing light of certain colors; (iv) both (i) and (ii); (v) all of (i), (ii), and (iii).

When a cut diamond is illuminated with
white light, it sparkles brilliantly with a
spectrum of vivid colors. These distinctive
visual features are a result of (i) light traveling
much slower in diamond than in air;
(ii) light of different colors traveling at
different
speeds in diamond; (iii) diamond
absorbing light of certain colors; (iv) both
(i) and (ii); (v) all of (i), (ii), and (iii).