| Judging
Clarity
External
features
Scratches,
nicks, pits, and abraded facet edges are not considered as
serious as inclusions because they can often be polished away.Extra
facets are additions to the normal number of facets (flat,
geometric diamond surfaces). They are usually added to polish
away a flaw or save diamond weight. They don't affect the
clarity grade of a diamond if they are on the pavilion and
can't be seen face up at ten-power magnification.
Naturals
are part of the original surface of the diamond crystal left
unpolished (fig. 6.18 & 6.19). Sometimes they have step-like
ridges or triangular forms (called trigons) on them that indicate
your stone is truly a diamond. Naturals do not affect the
clarity grade if they are confined to the girdle and do not
distort the girdle outline.
Clarity
Grading Explained
Now
that we have identified diamond inclusions and blemishes,
we are ready to look at how they affect clarity grades. There
are various grading systems, but those that are best known
resemble the one developed by the GIA (Gemological Institute
of America). You can make yourself understood to any knowledgeable
diamond dealer or jeweler in the world using the GIA system.
Clarity
grade descriptions of all the major systems assume a trained
grader working with ten-power fully corrected magnification
and effective illumination These definitions may seem unscientific,
and in fact they are unscientific.
However,
trained and experienced graders nearly always agree on the
clarity grade; an untrained or inexperienced grader will have
difficulty in determining clarity grades consistently. Diamonds
were not created to fit into well-defined categories. Categories
had to be created to differentiate already existing diamonds.
This was not an easy process.
The
specks might
Decrease
the brilliancy
Book
has stores
Are
called pinpoints
Indentations
where chunks
There
are various
Allows
people throughou
Unaided
eye through
Grading
reports can
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