question about heart & arrow

[PtlOO]

I plan to buy a small stone for an engagement ring. I find one in whiteflash, it does fit my need.
But it's not a heart & arrow cut, just "Round Ideal Cut", i don't know too much about the shape. Is h&a more pretty than a common round brilliant cut? any suggestions? also, is ags cert reliable? I've read some article said ags cert is better defined on cut, is that true?

Thanks!

 

[Garry H (Cut Nut)]

If you have a spare 10-15 minutes read the tutorial (link is top left on this page).
All your fears will be answered and advice given .