Does coal not sparkle because of its colour or because light does not refract / reflect from the cut facets? Thanks!
In: Physics
I’m not positive but I’m guessing you could polish coal and it would shine if not sparkle.
Diamonds are different because the material is transparent, you get reflections from the outside facets and reflections from light that passes through those facets and hits other facets. Light is bouncing around everywhere, aka sparkle.
A good diamond cut has geometry that intensifies the effect.
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