***** A Refraction of Light Question : Why Does Diamond Sparkle More? (Ans. ASAP plz) I have thought about this question for a while now,but I can't figure out the answer: Diamond has a critical angle of 24 degrees. Crown glass has a critical angle of 42 degrees. Why does a diamond sparkle more in bright light than a piece of crown glass, even with the equivalent shape? The light rays only reflect when their angles of incidence is less than the critical angle (I think!). 42 > 24, so diamond should let more light refract (or pass through and not reflect. So it should shine less! That's not what the question says! Help me out ASAP plz.