The original Hearts and Arrows were diamonds that surfaced in the
mid ***0s in Japan and embodied three important design
factors.
First, they were cut to “ideal proportions”,
Second, they were cut with superior physical and optical symmetry
so that they would garner a grade of “Excellent” in the Japanese
laboratories.
The third and very important factor was that they were cut to a
very specific brillanteering scheme to produce the accepted hearts
and arrows pattern.
This faceting scheme involves prescribed lengths and ratios as well
as smaller tables sizes that are imperative in producing a
distinctive, repeatable and gradable hearts and arrows pattern.