"Hearts" is the consequence of careful planning and precision cutting designed to maximize beauty and balanced light return in a diamond.
This is not trivial, and the great majority of people, when viewing diamonds, will prefer looking at a hearts and arrows diamond vs a non H&A diamond. That said, when comparing almost H&A vs true H&A, the difference is so small that even experienced professionals can't tell the two apart without aids like a H&A viewer, IdealScope, or magnifier.
This is not trivial, and the great majority of people, when viewing diamonds, will prefer looking at a hearts and arrows diamond vs a non H&A diamond. That said, when comparing almost H&A vs true H&A, the difference is so small that even experienced professionals can't tell the two apart without aids like a H&A viewer, IdealScope, or magnifier.