Flawless. The diamond shows no inclusions
or blemishes of any sort under 10X magnification
when observed by an experienced grader.
Note: Truly flawless or internally flawless
(F or IF on the GIA's grading scale)
diamonds are extremely rare.
Internally Flawless. Diamond has no
inclusions when examined by an experienced
grader using 10X magnification, but
will have some minor blemishes.
Very, Very slightly included. Diamond
contains minute inclusions that are
difficult even for experienced graders
to see under 10X magnification.
Very slightly included. Diamond contains
minute inclusions such as small crystals,
clouds or feathers when observed with
effort under 10X magnification.
Slightly included. Diamond contains
inclusions (clouds, included crystals,
knots, cavities, and feathers) that
are noticeable to an experienced grader
under 10X magnification.
I2, I3 =
Included. Diamond contains inclusions
(possibly large feathers or large included
crystals) that are obvious under 10X
magnification and may affect transparency
term carat (ct) is a measurement of
weight, not size. There are five carats
to a gram. A 1 ct sapphire is smaller
in size than a 1 ct diamond because
it is heavier. There are 100 points
to a carat, so a 50 point diamond weighs
1/2 of a carat or 0.50 ct.
term spread refers to the size a diamond
appears to be, based on its diameter.
So a 0.90 ct stone with less depth might
look the same size as a perfectly cut
1.00 CT diamond, but has less brilliance
because it is cut shallow.