In comparing 2 emerald cut stones, I noticed that in one, I seemed to see right into the stone. In the other, my eye focused more on the surface of the stone, and I thought the stone seemed brighter. I preferred the second stone, although part of the appeal of the emerald cut to me is that the depth of the stone is revealed. Could someone explain to me how this phenomenon relates to the concepts of brilliance, fire and scintillation for emerald cuts, and how these are tied to cut angles? Thanks.