It's unlikely that the GIA study had any impact on ideal cut prices
as they have actually expanded the range of what they consider will
produce a diamond with greater brilliance and fire outside of the
ideal range. More likely it is because of how much rough is being
released on the market suitable to cutting ideal cut stones and the
increase in interest from consumers in better cut stones. It could
also be that the Japanese economy is picking up steam a little and
that has increased demand for ideal cuts as the Japanese market has
traditionally been more focused on better quality goods.
Daniel R. Spirer, G.G.
Daniel R. Spirer Jewelers, LLC
1780 Massachusetts Ave.
Cambridge, MA 02140