The visual appearance of “Excellent to Very Good cut quality” old
European cut diamonds have the effect of returning sufficient light to
somewhat equate them to Modern Cut Class 1-2 range stones. “Normal
& Acceptable cut quality” old European cut diamonds are somewhat
equivalent in light return and visual appearance to Cut Class 3 modern
cut stones. “Poor Cut quality” old European cut diamonds are somewhat
equivalent to modern Cut Class 4 diamonds.
by David S. Atlas, GG(GIA) Sr Mbr(NAJA) ASG(AGA)