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To determine a diamond's
cut grade, an optical measuring device creates a three-dimensional model
to determine the diamond's proportions and angles. The interrelations
between these various dimensions will greatly affect how light reacts
once it enters and how it behaves upon exiting the diamond. By using
sophisticated computer modeling, it is possible to trace light behavior
and measure its levels of brilliance, fire and sparkle as it exits the
top of the diamond, referred to as the face-up appearance by
gemologists.
The GIA has only applied
excellent cut grade parameters to round brilliant stones at this time.
When a GIA cut grade is not available, A. Fishman & Son provides a
cut grade that allows you to compare diamonds using consistent criteria.
Polish describes the
smoothness of a diamond's facets, and symmetry refers to the alignment
of the facets. While polish and symmetry are worthy of noting, cut grade
is far more important. Polish and symmetry can be helpful in choosing
between two diamonds that are otherwise identical.
Fluorescence
refers to those diamonds that produce a visible reaction when exposed to
ultraviolet radiation. In laboratory experiments with both trained
gemologists and individuals with no diamond experience (meant to
represent the jewelry-buying public), no relationship was found between
fluorescence and a diamond's overall appearance.
Interestingly, BlueNile
states that diamonds with a strong or very strong fluorescence are a
better value for the end customer because the market prices them
slightly lower than diamonds with faint or negligible fluorescence. We
strongly disagree with this advice! Diamonds with strong or very strong
fluorescence sell for less because the "market" values them less.
Diamonds with strong or very strong fluorescence can often have a milky
or hazy look to it.
Clarity is a measure of
the number and size of the tiny imperfections that occur in almost all
diamonds. Because these imperfections tend to be microscopic, they do
not affect a diamond's beauty in any discernible way. Thus, while the
brilliance and sparkle of a well-cut diamond can help camouflage the
imperfections of a diamond with a lower clarity grade, it is difficult
to imagine a scenario where a diamond's imperfections are so large and
prominent as to mar a diamond's sparkle and brilliance. Regardless, A.
Fishman & Son would never sell a diamond of such low clarity.
For a three-stone ring,
A. Fishman & Son recommends that you choose the same cut grade for each
of the diamonds, but color and/or clarity can differ slightly. For
color, there will not be a visible difference within three grades. For
example, D, E, and F will each look the same. For clarity, anything VS2
or above will appear the same.
Yes. An appraisal
accompanies all diamond engagement rings. Read:
Diamond and Jewelry Appraisals
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