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Pavilion angle reached 41 degrees above will start to leak light:

http://www.prosumerdiamonds.com/maximising-value/
http://www.prosumerdiamonds.com/crown-angle/

Get the best proportions:
http://niceice.com/diamond-buying-secrets/...buying-success/

This is what I found from the two most readily available online tools.

GIA 2247322726

Enchanted cut score:
76.6. This diamond has an average cut.

HCA score:


GIA 6241427124

Enchanted cut score:
65.6. This diamond is either not well-cut, or has an unrecognized shape.

HCA score:


GIA 6241459779

Enchanted cut score:
76.3. This diamond has an average cut.

HCA score:


Based on the above scores, the first diamond obviously tops the lot, likely because of a shallow cut. Shallow cuts are not entirely bad as opposed to deep cut, cuz you get a larger face-up size. However, most shallow cuts exhibit the ring of death below its table a.k.a. the fisheye effect. So it is recommended to personally view the stone before making any decisions.